The present thesis investigates two theoretically novel processes of change in groups relevant to agents for change. Specifically, it examines the effects of group opinion change and reintegration on group members’ evaluation of ingroup change-agents. Group opinion change is operationalized as the group adopting the position advocated by a change-agent, and reintegration is operationalized as the group responding more positively towards a change-agent. These formulations of change processes within groups extend past theorizing in opinion deviance research (e.g., Festinger, 1950; Schachter, 1951; Marques & Paez, 1994) by a) examining how contextual differences that result from changes in the group may affect group members’ reactions to opinion deviates, and b) considering contingencies that result in acceptance or rejection of change-agents and their messages. In addition, this thesis investigates the psychological processes that may mediate and moderate the effects of group opinion change and reintegration on appraisals of change-agents. Specifically, it considers attributed motives of change-agents (i.e., perceived constructiveness; Hornsey, 2005), and target prototypicality (e.g., Hogg, 1993; Turner, Hogg, Oakes, Reicher, & Wetherell, 1987) as two possible mediators of these novel effects. Finally, group members’ identification with the group is examined as a moderator of these processes. Chapter 3 presents the first two experiments that tested the effects of group opinion change on the evaluation of change-agents. Experiment 1 (N=100) was a scenario-based study that had a change-agent express a non-conformist view of giving water to an outgroup state at a time when the ingroup state was experiencing a water crisis. Experiment 2 (N=103) was a scenario-based study that looked at a change-agent who expressed pro-immigration views to the ingroup country at an earlier time when popular attitudes toward immigration were poor. In both experiments the deviants were marginalized initially because they endorsed non-conformist opinions. Depending on the condition, group opinions either shifted toward the positions advocated by the deviants or remained unchanged. Results showed group members’ target evaluations shifted as a function of group opinion change. Target evaluations became less favourable in Experiment 1, and more favourable in Experiment 2. There also was evidence that increased perceived constructiveness mediated more favourable target evaluations in Experiment 2. Chapter 4 presents the first two experiments that tested the effects of reintegration and group members’ identification on the evaluation of change-agents. Both Experiments 3 (N=103) and 4 (N=94) involved a scenario where there was a severe drought in the ingroup state. In Experiment 3, a deviant politician argued for more investment on water infrastructure 10 years earlier when water shortage was not a critical problem. Thus, the politician expressed a minority opinion. In Experiment 4, a deviant water commissioner expressed a controversial opinion to give water to an outgroup state at the height of the drought. Both deviants were marginalized/excluded initially by the group. Reintegration was manipulated by showing that popular support for the deviant had increased (Experiment 3) or the deviant was reinstated (Experiment 4), or the group did not increase support for the deviant at all (not reintegrated). Results showed that high identifiers evaluated the deviant less positively, and perceived the deviant as more destructive after he or she was reintegrated than when marginalization continued. Further, perceived destructiveness mediated the effects of reintegration and identification on trait evaluations. Experiment 4 also showed that high identifiers were less willing to support change after the deviant was reintegrated, than when marginalization continued. Finally, Chapter 5 tested the interactive effects of group opinion change and reintegration on evaluation of change-agents. I also assessed group members’ responses to change-agents in light of the group’s resistance to change even though the change-agents were right and the groups were wrong. Experiment 5 was a scenario-based study in a minimal-groups situation that had a deviant arguing for a more equitable research funding than the existing distribution. Experiment 6 was a scenario-based study on the disagreement between Galileo Galilei and the Catholic Church on planetary motion. Again, the deviants initially were marginalized by the groups. For opinion change, the groups either adopted or rejected the deviants’ opinions. For reintegration, the groups either treated the deviants more favourably or continued to reject them. Results showed that either opinion change or reintegration was sufficient to defuse negativity towards the deviants. More importantly, group members continued mistreating the deviants when the groups rejected opinion change and reintegration. That is, negativity towards the deviants was highest when opinion was unchanged, and marginalization continued. Overall, this thesis shows that group members’ evaluations of deviant agents for change can shift as a function of group opinion change and reintegration. Group opinion change and/or reintegration defuse negativity toward change-agents in the absence of psychological threat (i.e., perceived destructiveness). However, if threat is present, opinion change or reintegration may ironically elicit more group members’ negativity towards these targets. This thesis also contributes to the literature by showing how change promotes or inhibits group members’ endorsement of change-agents.

The present thesis investigates two theoretically novel processes of change in groups relevant to agents for change. Specifically, it examines the effects of group opinion change and reintegration on group members’ evaluation of ingroup change-agents. Group opinion change is operationalized as the group adopting the position advocated by a change-agent, and reintegration is operationalized as the group responding more positively towards a change-agent. These formulations of change processes within groups extend past theorizing in opinion deviance research (e.g., Festinger, 1950; Schachter, 1951; Marques & Paez, 1994) by a) examining how contextual differences that result from changes in the group may affect group members’ reactions to opinion deviates, and b) considering contingencies that result in acceptance or rejection of change-agents and their messages. In addition, this thesis investigates the psychological processes that may mediate and moderate the effects of group opinion change and reintegration on appraisals of change-agents. Specifically, it considers attributed motives of change-agents (i.e., perceived constructiveness; Hornsey, 2005), and target prototypicality (e.g., Hogg, 1993; Turner, Hogg, Oakes, Reicher, & Wetherell, 1987) as two possible mediators of these novel effects. Finally, group members’ identification with the group is examined as a moderator of these processes. Chapter 3 presents the first two experiments that tested the effects of group opinion change on the evaluation of change-agents. Experiment 1 (N=100) was a scenario-based study that had a change-agent express a non-conformist view of giving water to an outgroup state at a time when the ingroup state was experiencing a water crisis. Experiment 2 (N=103) was a scenario-based study that looked at a change-agent who expressed pro-immigration views to the ingroup country at an earlier time when popular attitudes toward immigration were poor. In both experiments the deviants were marginalized initially because they endorsed non-conformist opinions. Depending on the condition, group opinions either shifted toward the positions advocated by the deviants or remained unchanged. Results showed group members’ target evaluations shifted as a function of group opinion change. Target evaluations became less favourable in Experiment 1, and more favourable in Experiment 2. There also was evidence that increased perceived constructiveness mediated more favourable target evaluations in Experiment 2. Chapter 4 presents the first two experiments that tested the effects of reintegration and group members’ identification on the evaluation of change-agents. Both Experiments 3 (N=103) and 4 (N=94) involved a scenario where there was a severe drought in the ingroup state. In Experiment 3, a deviant politician argued for more investment on water infrastructure 10 years earlier when water shortage was not a critical problem. Thus, the politician expressed a minority opinion. In Experiment 4, a deviant water commissioner expressed a controversial opinion to give water to an outgroup state at the height of the drought. Both deviants were marginalized/excluded initially by the group. Reintegration was manipulated by showing that popular support for the deviant had increased (Experiment 3) or the deviant was reinstated (Experiment 4), or the group did not increase support for the deviant at all (not reintegrated). Results showed that high identifiers evaluated the deviant less positively, and perceived the deviant as more destructive after he or she was reintegrated than when marginalization continued. Further, perceived destructiveness mediated the effects of reintegration and identification on trait evaluations. Experiment 4 also showed that high identifiers were less willing to support change after the deviant was reintegrated, than when marginalization continued. Finally, Chapter 5 tested the interactive effects of group opinion change and reintegration on evaluation of change-agents. I also assessed group members’ responses to change-agents in light of the group’s resistance to change even though the change-agents were right and the groups were wrong. Experiment 5 was a scenario-based study in a minimal-groups situation that had a deviant arguing for a more equitable research funding than the existing distribution. Experiment 6 was a scenario-based study on the disagreement between Galileo Galilei and the Catholic Church on planetary motion. Again, the deviants initially were marginalized by the groups. For opinion change, the groups either adopted or rejected the deviants’ opinions. For reintegration, the groups either treated the deviants more favourably or continued to reject them. Results showed that either opinion change or reintegration was sufficient to defuse negativity towards the deviants. More importantly, group members continued mistreating the deviants when the groups rejected opinion change and reintegration. That is, negativity towards the deviants was highest when opinion was unchanged, and marginalization continued. Overall, this thesis shows that group members’ evaluations of deviant agents for change can shift as a function of group opinion change and reintegration. Group opinion change and/or reintegration defuse negativity toward change-agents in the absence of psychological threat (i.e., perceived destructiveness). However, if threat is present, opinion change or reintegration may ironically elicit more group members’ negativity towards these targets. This thesis also contributes to the literature by showing how change promotes or inhibits group members’ endorsement of change-agents.

The present thesis investigates two theoretically novel processes of change in groups relevant to agents for change. Specifically, it examines the effects of group opinion change and reintegration on group members’ evaluation of ingroup change-agents. Group opinion change is operationalized as the group adopting the position advocated by a change-agent, and reintegration is operationalized as the group responding more positively towards a change-agent. These formulations of change processes within groups extend past theorizing in opinion deviance research (e.g., Festinger, 1950; Schachter, 1951; Marques & Paez, 1994) by a) examining how contextual differences that result from changes in the group may affect group members’ reactions to opinion deviates, and b) considering contingencies that result in acceptance or rejection of change-agents and their messages. In addition, this thesis investigates the psychological processes that may mediate and moderate the effects of group opinion change and reintegration on appraisals of change-agents. Specifically, it considers attributed motives of change-agents (i.e., perceived constructiveness; Hornsey, 2005), and target prototypicality (e.g., Hogg, 1993; Turner, Hogg, Oakes, Reicher, & Wetherell, 1987) as two possible mediators of these novel effects. Finally, group members’ identification with the group is examined as a moderator of these processes. Chapter 3 presents the first two experiments that tested the effects of group opinion change on the evaluation of change-agents. Experiment 1 (N=100) was a scenario-based study that had a change-agent express a non-conformist view of giving water to an outgroup state at a time when the ingroup state was experiencing a water crisis. Experiment 2 (N=103) was a scenario-based study that looked at a change-agent who expressed pro-immigration views to the ingroup country at an earlier time when popular attitudes toward immigration were poor. In both experiments the deviants were marginalized initially because they endorsed non-conformist opinions. Depending on the condition, group opinions either shifted toward the positions advocated by the deviants or remained unchanged. Results showed group members’ target evaluations shifted as a function of group opinion change. Target evaluations became less favourable in Experiment 1, and more favourable in Experiment 2. There also was evidence that increased perceived constructiveness mediated more favourable target evaluations in Experiment 2. Chapter 4 presents the first two experiments that tested the effects of reintegration and group members’ identification on the evaluation of change-agents. Both Experiments 3 (N=103) and 4 (N=94) involved a scenario where there was a severe drought in the ingroup state. In Experiment 3, a deviant politician argued for more investment on water infrastructure 10 years earlier when water shortage was not a critical problem. Thus, the politician expressed a minority opinion. In Experiment 4, a deviant water commissioner expressed a controversial opinion to give water to an outgroup state at the height of the drought. Both deviants were marginalized/excluded initially by the group. Reintegration was manipulated by showing that popular support for the deviant had increased (Experiment 3) or the deviant was reinstated (Experiment 4), or the group did not increase support for the deviant at all (not reintegrated). Results showed that high identifiers evaluated the deviant less positively, and perceived the deviant as more destructive after he or she was reintegrated than when marginalization continued. Further, perceived destructiveness mediated the effects of reintegration and identification on trait evaluations. Experiment 4 also showed that high identifiers were less willing to support change after the deviant was reintegrated, than when marginalization continued. Finally, Chapter 5 tested the interactive effects of group opinion change and reintegration on evaluation of change-agents. I also assessed group members’ responses to change-agents in light of the group’s resistance to change even though the change-agents were right and the groups were wrong. Experiment 5 was a scenario-based study in a minimal-groups situation that had a deviant arguing for a more equitable research funding than the existing distribution. Experiment 6 was a scenario-based study on the disagreement between Galileo Galilei and the Catholic Church on planetary motion. Again, the deviants initially were marginalized by the groups. For opinion change, the groups either adopted or rejected the deviants’ opinions. For reintegration, the groups either treated the deviants more favourably or continued to reject them. Results showed that either opinion change or reintegration was sufficient to defuse negativity towards the deviants. More importantly, group members continued mistreating the deviants when the groups rejected opinion change and reintegration. That is, negativity towards the deviants was highest when opinion was unchanged, and marginalization continued. Overall, this thesis shows that group members’ evaluations of deviant agents for change can shift as a function of group opinion change and reintegration. Group opinion change and/or reintegration defuse negativity toward change-agents in the absence of psychological threat (i.e., perceived destructiveness). However, if threat is present, opinion change or reintegration may ironically elicit more group members’ negativity towards these targets. This thesis also contributes to the literature by showing how change promotes or inhibits group members’ endorsement of change-agents.

Abstract This research investigated the extent to which taking notes influenced the quality of mock jurors’ decisions. High quality decisions were defined in this research as those which did not reflect the influence of the offender stereotype. The impact of note taking on the quality of jurors’ decisions is central to the judicial community’s concerns about note taking as a jury aid and their willingness to offer it in trial contexts. Previous research has argued that note takers make better quality decisions than non-note takers because note takers recall more trial content and make judgements that better reflect the evidence presented. However, according to dual process models of persuasion, high quality decisions should show evidence of both effortful processing of information and no influence of peripheral cues, such as stereotypes. To date, the existing literature has neglected to consider the extent to which note takers, as compared to non-note takers, are influenced by peripheral cues. The current research sought to address this by investigating the extent to which note taking and non-note taking mock jurors were influenced by stereotypes when making decisions in a mock criminal trial. In particular, note taking and non-note taking mock jurors were presented with a criminal trial in which either a male or female defendant had been charged with a stereotypically masculine crime (e.g., aggravated robbery or murder). The extent to which mock jurors were more likely to convict the male defendant and acquit the female defendant was used as a marker of the extent that stereotypes about offenders influenced participants in these studies. Across studies, note takers’ perceptions of guilt, evaluation of the defendant, and, in some instances, recall of trial content, reflected stereotype-based processing while the corresponding measures for non-note takers did not. This research then went on to investigate why note takers were more vulnerable to the influence of stereotypes than non-note takers. It was proposed that one reason might be the requirement that note takers simultaneously record and evaluate trial content. Previous research has shown that persons engaged in dual tasks rely on stereotypes to increase information processing efficiency and are therefore able to re-direct cognitive resources to the additional task. Consistent with previous studies, the current research found that both note takers and mock jurors engaged in an additional task during the trial were more vulnerable to the influence of stereotypes than non-note takers. Furthermore, whilst investigating interventions designed to reduce the influence of stereotypes on note takers’ decisions, results revealed that such interventions were less successful in improving decision quality than interventions that removed the requirement to engage in dual tasks. In particular, the influence of stereotypes was reduced when note takers were encouraged to elaborate on the content of their notes during designated review periods. Whilst methodological features of this research program--namely a reliance on student samples and the relative brevity of mock trials used--may have led to an underestimation of the reliance on stereotypes for note takers, the research has implications for the instructions given to jurors about note taking in judicial contexts. Specifically, the central conclusion of the thesis is that it would seem prudent to amend instructions to direct note takers to engage in the effortful review of their notes prior to coming together to reach a verdict.

Abstract This study examined memory functioning from a female perspective, with the aim of determining factors that might impact performance and render the accuracy of memory measurement, particularly with advancing age, problematic. Factors investigated, among others, were the role of attention and/or engagement with the memory tasks administered, state affect (i.e., positive and negative arousal) at time of testing, subjective memory appraisal, particularly in the domain of perceived memory self-efficacy (MSE), and the use of hormone replacement therapy (HRT) by older post-menopausal women. Two experimental computer-based tests of episodic memory, Paired Associates (PA) and Serial Recall (SR), were administered to 181 female participants aged 18 to 86 years. The tasks were designed to emphasise components that make episodic memory especially difficult, and minimise the use of strategies that might assist recall. Thus, they varied the requirement for recall as opposed to recognition, the need to form an association between a pair of unrelated words, and the need to discriminate the most recent list from earlier list(s). Other measures used included a demographic survey administered to participants individually in an interview format, and a number of variables examined in this study derived from responses to items contained in this survey. The research battery also included psychometric measures of transient affective states, psychological well-being, alertness, in addition to measures of global cognitive status and metamemory (i.e., subjective memory appraisal). The overall aim was to examine a range of factors that might influence episodic memory performance in cognitively intact healthy women, and thus render the interpretation of age-related changes to memory functioning problematic. For analyses participants were assigned to three groups - young, middle-aged and older. There were 60 young adults aged 18 to 29 years, 60 middle-aged adults aged 49 to 60 years, and 61 older adults aged 61 to 86 years. Each participant was tested individually in a single session lasting approximately 3 ½ hours, with younger participants requiring less time to complete assessments. Order of test administration and instructions were standardised across the entire sample. Inferential statistics included correlation, t-test statistic, and analysis of variance (ANOVA) with Tukey post-hoc comparisons. Hierarchical multiple regression analyses were conducted to determine key correlates of memory performance outcomes. No significant differences between the cohorts were found in mean years of education. However, episodic memory recall differed significantly by age group. As expected, young adults recalled significantly more words in the memory tasks than their older counterparts, and middle-aged adults outperformed adults in the oldest cohort. Moreover, older adults’ performance deficits were more pronounced in the tasks requiring that they make an association between a pair of unrelated words. Across all cases, transient mood states were significantly related to memory scores; however, individuals in the oldest cohort were particularly vulnerable to mood fluctuations. This cohort experienced a significantly greater decline in positive affect and a significant greater increase in negative affect while undergoing memory testing, highlighting their greater vulnerability to stressors inherent in a memory testing situation. Although scores on the measure of attention were near ceiling, indicative of participants’ level of effort, motivation, and engagement with the memory tasks, the measure of attention discriminated between older and younger adults’ results, and was a key predictor of memory performance. Noteworthy is that attention scores significantly contributed to performance variability in younger and older adults but not in middle-aged adults. Across all cases, age, education, and attention were the key contributing factors to variability in memory scores. Although four lifestyle factors: (1) subjective sleep appraisal, (2) body mass index (BMI), (3) physical activity, and (4) caffeine intake were significantly associated with performance in the memory tasks, once the effects of these key variables were removed, lifestyle factor did not uniquely contribute to performance variability. Moreover, no association was found between hormone replacement therapy (HRT) and episodic memory performance across the broader sample. However, in a small subgroup of older women (n = 15, M age = 66 years), long-term users of this treatment, HRT had a significant effect on memory performance and was indicative of better recall on the memory tasks. The effect of subjective memory appraisal, MSE included, on objective performance outcomes was examined. The results showed that memory self-evaluations were not a significant contributing factor to episodic memory performance, confirming that memory self-appraisal is a poor predictor of actual memory performance, and thus does not pose a challenge to the measurement of age-related changes to memory abilities. Although there were commonalities, factors influencing memory performance differed by age cohort. For example, in young adults, positive mood, a perception of sleeping well, subjective health, and attention were significantly related to performance on the memory tasks. However, once the effect of attention was removed in the regression analysis, no other variable was predictive of episodic memory functioning in this cohort. In contrast, the single significant predictor of memory performance in middle-aged individuals was education, and neither attention, nor positive mood, or physical activity had a significant effect on this cohort’s performance. Similarly, having more years of formal education benefited older adults’ episodic memory functioning. However, high scores on global cognitive functioning and on the tasks measuring attention were equally important to episodic memory recall in this age group. In sum, the significant contribution of age to memory variability attested to the utility of the memory measures in detecting age-related changes to episodic memory functioning, which were independent of deficits in attention or level of education. Moreover, the effect of several factors (e.g., transient mood, lifestyle) on memory scores was explained by an effect on attention, and this has clear implication for the proper evaluation of long-term changes to memory functioning. Limitations of the study and suggestion for future research are discussed.

This thesis examined the intra-individual relationship between state affect and task performance, with an emphasis on a) the moderating effects of trait affect and task difficulty; and b) the mediating effects of cognitive and affective regulation. Theory and empirical research from the emotion, motivation, and personality literatures was integrated to develop a multilevel model of states, traits, and situational factors as predictors of task performance. Data from five studies were analysed using single- and multi-level techniques to test the hypothesised model of relationships. The findings are reported within three manuscripts, which comprise the body of this thesis. Manuscript 1 presents validation evidence for the psychometric instruments used to measure the self-regulatory components of the model. Three studies (N = 758) were conducted to examine the nomological network of cognitive and affective regulation. In parallel, two new self-report scales were developed to operationalise these constructs within a repeated measures paradigm. The three studies demonstrated that the new cognitive and affective regulation scales were uniquely associated with other self-regulatory, personality, affective and achievement variables at the intra-individual and inter-individual levels. Study 1 provided evidence for the unidimensionality, internal consistency, and construct validity of each scale. Study 2 replicated and extended construct validity evidence using a different sample and performance domain. Study 3 established the utility of each scale for assessing intra-individual variability in cognitive and affective regulation, and their ability to predict performance within individuals. In sum, the three studies suggested that the new measures of cognitive and affective regulation were psychometrically adequate for use in model testing. Manuscripts 2 and 3 tested the intra-individual relationship between state affect and task performance, with a focus on the moderating effects of trait affect and task difficulty (Manuscript 2), and the mediating effects of cognitive and affective regulation (Manuscript 3). Each manuscript analysed different portions of data from two laboratory experiments (N = 182). In each experiment, participants performed multiple trials of an air-traffic control simulation that varied in task difficulty at the inter-individual (Study 4) or intra-individual (Study 5) level. Trait positive and negative affect were measured before the task, whereas state positive and negative affect, cognitive and affective regulation, and task performance were measured at repeated intervals over practice. In Manuscript 2, hierarchical linear modelling demonstrated that state positive affect was positively related, whereas state negative affect was negatively related, to task performance at the intra-individual level of analysis. As hypothesised, the strength of these affect-performance relationships was significantly moderated by trait affect and task difficulty. In both studies, the positive intra-individual relationship between state positive affect and performance was stronger for individuals with high (versus low) trait positive affect, particularly when task difficulty was high (versus low). In contrast, the negative intra-individual relationship between state negative affect and performance only emerged for individuals with low (versus high) trait negative affect, regardless of the level of task difficulty. In Study 4, the intra-individual relationship between state negative affect and task performance was also more pronounced when task difficulty was high (versus low). In Manuscript 3, multilevel multiple-mediation modelling demonstrated that cognitive regulation significantly mediated the intra-individual relationship between state positive affect and performance in both studies, alongside the intra-individual relationship between state negative affect and performance in Study 4. Unexpectedly, affective regulation failed to mediate either of these affect-performance relationships. However, state positive affect was positively related to affective regulation in both studies, whereas state negative affect was positively related to affective regulation in Study 5. Overall, this thesis makes theoretical, empirical and methodological contributions to understanding how affect relates to performance at the intra-individual level of analysis; and for whom, when, and why these relationships emerge. Within a multilevel framework, it integrates interdisciplinary perspectives to identify the affective determinants of performance from two levels of analysis. The results demonstrate that state positive and negative affect can differentially predict intra-individual variability in task performance, and that these effects may a) depend on trait affect and task difficulty; and b) be partially explained by cognitive regulation. These findings emphasise the importance of adopting a multilevel, repeated measures paradigm to examine how affective states, traits, and task demands interactively predict task performance. There is scope for extending this research further by investigating a broader range of moderating and mediating constructs. Practical implications and directions for future research are discussed.

This thesis examined the intra-individual relationship between state affect and task performance, with an emphasis on a) the moderating effects of trait affect and task difficulty; and b) the mediating effects of cognitive and affective regulation. Theory and empirical research from the emotion, motivation, and personality literatures was integrated to develop a multilevel model of states, traits, and situational factors as predictors of task performance. Data from five studies were analysed using single- and multi-level techniques to test the hypothesised model of relationships. The findings are reported within three manuscripts, which comprise the body of this thesis. Manuscript 1 presents validation evidence for the psychometric instruments used to measure the self-regulatory components of the model. Three studies (N = 758) were conducted to examine the nomological network of cognitive and affective regulation. In parallel, two new self-report scales were developed to operationalise these constructs within a repeated measures paradigm. The three studies demonstrated that the new cognitive and affective regulation scales were uniquely associated with other self-regulatory, personality, affective and achievement variables at the intra-individual and inter-individual levels. Study 1 provided evidence for the unidimensionality, internal consistency, and construct validity of each scale. Study 2 replicated and extended construct validity evidence using a different sample and performance domain. Study 3 established the utility of each scale for assessing intra-individual variability in cognitive and affective regulation, and their ability to predict performance within individuals. In sum, the three studies suggested that the new measures of cognitive and affective regulation were psychometrically adequate for use in model testing. Manuscripts 2 and 3 tested the intra-individual relationship between state affect and task performance, with a focus on the moderating effects of trait affect and task difficulty (Manuscript 2), and the mediating effects of cognitive and affective regulation (Manuscript 3). Each manuscript analysed different portions of data from two laboratory experiments (N = 182). In each experiment, participants performed multiple trials of an air-traffic control simulation that varied in task difficulty at the inter-individual (Study 4) or intra-individual (Study 5) level. Trait positive and negative affect were measured before the task, whereas state positive and negative affect, cognitive and affective regulation, and task performance were measured at repeated intervals over practice. In Manuscript 2, hierarchical linear modelling demonstrated that state positive affect was positively related, whereas state negative affect was negatively related, to task performance at the intra-individual level of analysis. As hypothesised, the strength of these affect-performance relationships was significantly moderated by trait affect and task difficulty. In both studies, the positive intra-individual relationship between state positive affect and performance was stronger for individuals with high (versus low) trait positive affect, particularly when task difficulty was high (versus low). In contrast, the negative intra-individual relationship between state negative affect and performance only emerged for individuals with low (versus high) trait negative affect, regardless of the level of task difficulty. In Study 4, the intra-individual relationship between state negative affect and task performance was also more pronounced when task difficulty was high (versus low). In Manuscript 3, multilevel multiple-mediation modelling demonstrated that cognitive regulation significantly mediated the intra-individual relationship between state positive affect and performance in both studies, alongside the intra-individual relationship between state negative affect and performance in Study 4. Unexpectedly, affective regulation failed to mediate either of these affect-performance relationships. However, state positive affect was positively related to affective regulation in both studies, whereas state negative affect was positively related to affective regulation in Study 5. Overall, this thesis makes theoretical, empirical and methodological contributions to understanding how affect relates to performance at the intra-individual level of analysis; and for whom, when, and why these relationships emerge. Within a multilevel framework, it integrates interdisciplinary perspectives to identify the affective determinants of performance from two levels of analysis. The results demonstrate that state positive and negative affect can differentially predict intra-individual variability in task performance, and that these effects may a) depend on trait affect and task difficulty; and b) be partially explained by cognitive regulation. These findings emphasise the importance of adopting a multilevel, repeated measures paradigm to examine how affective states, traits, and task demands interactively predict task performance. There is scope for extending this research further by investigating a broader range of moderating and mediating constructs. Practical implications and directions for future research are discussed.

Traditionally, language was proposed to be mediated by various left hemisphere perisylvian structures and the associated role of the motor cortices was limited to tasks such as articulation. Recent theoretical models have proposed that effector specific words with motor related meaning are represented somatotopically on the primary motor (Brodmann’s Area 4) and premotor (Brodmann’s Area 6) cortices. For example, it has been reported that when verbs associated with the hand (e.g., pick) are processed, the primary and premotor areas involved with moving the hand are engaged. However, fundamental methodological problems exist within the reported research. This thesis aimed to address and correct the inconsistencies and methodological limitations within the existing literature to provide more conclusive evidence regarding the involvement of the primary and premotor cortices in processing verbs with motor related meaning. This thesis also aimed to investigate whether the names of effectors (nouns) also involve processing by the motor cortices, either generally or somatotopically. Three behavioural dual task experiments and one fMRI experiment were conducted. Results indicated no evidence of somatotopically organised overlapping activation in the primary or premotor cortex between the various semantic categories of words and related effector movements. However, in the fMRI experiment, motor related verbs in general yielded significant overlapping activity between reading all effector related verbs and moving all effectors in the pre-supplementary motor area of the premotor cortex. These findings indicate that an embodied language involving somatotopic representations of effector specific verbs on the primary or premotor cortex is unlikely to be the case. Rather there appears to be a more general representation of effector related verbs in a more cognitive than motor area of the premotor cortex. The findings of this thesis are consistent a wealth of evidence supporting the motor cortices being generally associated with motor related language and with the idea that semantic representations are distributed throughout the brain according to the embodied cognitive framework, rather than being localised to amodal regions that process all words.

Abstract This study examined memory functioning from a female perspective, with the aim of determining factors that might impact performance and render the accuracy of memory measurement, particularly with advancing age, problematic. Factors investigated, among others, were the role of attention and/or engagement with the memory tasks administered, state affect (i.e., positive and negative arousal) at time of testing, subjective memory appraisal, particularly in the domain of perceived memory self-efficacy (MSE), and the use of hormone replacement therapy (HRT) by older post-menopausal women. Two experimental computer-based tests of episodic memory, Paired Associates (PA) and Serial Recall (SR), were administered to 181 female participants aged 18 to 86 years. The tasks were designed to emphasise components that make episodic memory especially difficult, and minimise the use of strategies that might assist recall. Thus, they varied the requirement for recall as opposed to recognition, the need to form an association between a pair of unrelated words, and the need to discriminate the most recent list from earlier list(s). Other measures used included a demographic survey administered to participants individually in an interview format, and a number of variables examined in this study derived from responses to items contained in this survey. The research battery also included psychometric measures of transient affective states, psychological well-being, alertness, in addition to measures of global cognitive status and metamemory (i.e., subjective memory appraisal). The overall aim was to examine a range of factors that might influence episodic memory performance in cognitively intact healthy women, and thus render the interpretation of age-related changes to memory functioning problematic. For analyses participants were assigned to three groups - young, middle-aged and older. There were 60 young adults aged 18 to 29 years, 60 middle-aged adults aged 49 to 60 years, and 61 older adults aged 61 to 86 years. Each participant was tested individually in a single session lasting approximately 3 ½ hours, with younger participants requiring less time to complete assessments. Order of test administration and instructions were standardised across the entire sample. Inferential statistics included correlation, t-test statistic, and analysis of variance (ANOVA) with Tukey post-hoc comparisons. Hierarchical multiple regression analyses were conducted to determine key correlates of memory performance outcomes. No significant differences between the cohorts were found in mean years of education. However, episodic memory recall differed significantly by age group. As expected, young adults recalled significantly more words in the memory tasks than their older counterparts, and middle-aged adults outperformed adults in the oldest cohort. Moreover, older adults’ performance deficits were more pronounced in the tasks requiring that they make an association between a pair of unrelated words. Across all cases, transient mood states were significantly related to memory scores; however, individuals in the oldest cohort were particularly vulnerable to mood fluctuations. This cohort experienced a significantly greater decline in positive affect and a significant greater increase in negative affect while undergoing memory testing, highlighting their greater vulnerability to stressors inherent in a memory testing situation. Although scores on the measure of attention were near ceiling, indicative of participants’ level of effort, motivation, and engagement with the memory tasks, the measure of attention discriminated between older and younger adults’ results, and was a key predictor of memory performance. Noteworthy is that attention scores significantly contributed to performance variability in younger and older adults but not in middle-aged adults. Across all cases, age, education, and attention were the key contributing factors to variability in memory scores. Although four lifestyle factors: (1) subjective sleep appraisal, (2) body mass index (BMI), (3) physical activity, and (4) caffeine intake were significantly associated with performance in the memory tasks, once the effects of these key variables were removed, lifestyle factor did not uniquely contribute to performance variability. Moreover, no association was found between hormone replacement therapy (HRT) and episodic memory performance across the broader sample. However, in a small subgroup of older women (n = 15, M age = 66 years), long-term users of this treatment, HRT had a significant effect on memory performance and was indicative of better recall on the memory tasks. The effect of subjective memory appraisal, MSE included, on objective performance outcomes was examined. The results showed that memory self-evaluations were not a significant contributing factor to episodic memory performance, confirming that memory self-appraisal is a poor predictor of actual memory performance, and thus does not pose a challenge to the measurement of age-related changes to memory abilities. Although there were commonalities, factors influencing memory performance differed by age cohort. For example, in young adults, positive mood, a perception of sleeping well, subjective health, and attention were significantly related to performance on the memory tasks. However, once the effect of attention was removed in the regression analysis, no other variable was predictive of episodic memory functioning in this cohort. In contrast, the single significant predictor of memory performance in middle-aged individuals was education, and neither attention, nor positive mood, or physical activity had a significant effect on this cohort’s performance. Similarly, having more years of formal education benefited older adults’ episodic memory functioning. However, high scores on global cognitive functioning and on the tasks measuring attention were equally important to episodic memory recall in this age group. In sum, the significant contribution of age to memory variability attested to the utility of the memory measures in detecting age-related changes to episodic memory functioning, which were independent of deficits in attention or level of education. Moreover, the effect of several factors (e.g., transient mood, lifestyle) on memory scores was explained by an effect on attention, and this has clear implication for the proper evaluation of long-term changes to memory functioning. Limitations of the study and suggestion for future research are discussed.

Traditionally, language was proposed to be mediated by various left hemisphere perisylvian structures and the associated role of the motor cortices was limited to tasks such as articulation. Recent theoretical models have proposed that effector specific words with motor related meaning are represented somatotopically on the primary motor (Brodmann’s Area 4) and premotor (Brodmann’s Area 6) cortices. For example, it has been reported that when verbs associated with the hand (e.g., pick) are processed, the primary and premotor areas involved with moving the hand are engaged. However, fundamental methodological problems exist within the reported research. This thesis aimed to address and correct the inconsistencies and methodological limitations within the existing literature to provide more conclusive evidence regarding the involvement of the primary and premotor cortices in processing verbs with motor related meaning. This thesis also aimed to investigate whether the names of effectors (nouns) also involve processing by the motor cortices, either generally or somatotopically. Three behavioural dual task experiments and one fMRI experiment were conducted. Results indicated no evidence of somatotopically organised overlapping activation in the primary or premotor cortex between the various semantic categories of words and related effector movements. However, in the fMRI experiment, motor related verbs in general yielded significant overlapping activity between reading all effector related verbs and moving all effectors in the pre-supplementary motor area of the premotor cortex. These findings indicate that an embodied language involving somatotopic representations of effector specific verbs on the primary or premotor cortex is unlikely to be the case. Rather there appears to be a more general representation of effector related verbs in a more cognitive than motor area of the premotor cortex. The findings of this thesis are consistent a wealth of evidence supporting the motor cortices being generally associated with motor related language and with the idea that semantic representations are distributed throughout the brain according to the embodied cognitive framework, rather than being localised to amodal regions that process all words.