Purpose: To investigate the effects of vocabulary, working memory, age, semantic context, and signal-to-noise-ratio (SNR) on speech recognition in adverse conditions (multitalker babble) in normal-hearing listeners aged 18-35. First, a general hypothesis was tested that listeners with larger receptive vocabularies would be more accurate at recognising speech in noise than listeners with more limited receptive vocabularies, even when target stimuli are words with high lexical frequency. A second more specific hypothesis was that the vocabulary would be predictive of speech recognition accuracy when the signal was moderately degraded, but not mildly or severely degraded. Method: 80 sentences with a high (HP) or low (LP) degree of semantic predictability (40 HP and 40 LP) were recorded from a male speaker of NZ English. These sentences were used as experimental target stimuli, and presented in multitalker babble at four SNRs: -8, -4, 0 and 4 dB SNR. Thirty-five participants (11 males and 24 females, aged 18 to 35), with puretone hearing thresholds of 15 dB HL or better, completed the Peabody Picture Vocabulary Test (PPVT) and the Wechsler Adult Intelligence Scale (WAIS) vocabulary subtest, the WAIS working memory subtests, and the experimental listening task in which they were required to repeat back the target sentences. Results: There was considerable variability between listeners in speech recognition performance, in terms of percent words accurately recognised overall (M = 45.8%; SD = 7.4) and for both HP (M = 54.4%; SD = 9.8) and LP (M = 35%; SD = 8.9) conditions. Hierarchical multiple regression analyses revealed that receptive (PPVT) and productive (WAIS) vocabulary knowledge, but not working memory, contributed 8 significant variance to listeners’ speech recognition scores overall and in both the HP and LP conditions. Further regression analyses at individual SNR levels showed that receptive vocabulary contributed significant variance to listening recognition scores in all predictability and SNR conditions except the most favourable (HP stimuli at 4 dB SNR) and least favourable (LP stimuli at -8 dB SNR) listening conditions. Working memory and age were not significantly related to overall listening score, HP listening score, or LP listening score, but age did contribute significant variance in the - 4dB SNR LP condition. Conclusion: The results provide further evidence that greater vocabulary knowledge is associated with improved speech recognition in adverse conditions. This effect was salient in mid-range adverse listening conditions, but was not apparent in highly favourable and extremely poor listening conditions. The results were interpreted to suggest that in moderately adverse listening conditions listeners with larger lexicons may be better able to exploit redundancies and/or intelligible ‘glimpses’ in the speech signal.

Bibliography: leaves 179-215 / 1 v. (various pagings) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Psychology, 1993

Masters Research - Master of Philosophy (MPhil) / The psychosocial stress of social conflict contributes to the development of depression and anxiety in those individuals vulnerable to its effects, yet the factors that contribute to vulnerability remain unclear. Researchers investigating factors such as behaviour and physiology have used the animal resident/intruder social conflict model whereby a young male rodent (intruder) is placed into the home cage of an older male (resident) that is trained to attack and defeat all intruders. Findings reported previously have shown that defeated intruders displayed medium to longer-term stress-related changes in behaviour and physiology, with considerable variability in the severity of these changes reported from one individual to another. Interestingly, a reduction in severity of behavioural and physiological changes was associated most significantly with intruders that deployed ‘active coping’ behaviours during the social defeat interaction than animals that deployed ‘passive coping’. However, these findings do not describe the short-term effects, raising the question; does coping style also influence the short-term stress response? We investigated the relationship between coping behaviour adopted by intruders during a 10 minute social conflict culminating in defeat and both acute peak plasma corticosterone (CORT) stress hormone levels and number of cells expressing Fos protein in eight brain regions. Our investigations revealed that higher levels of fight and guard behaviours were associated with lower peak plasma CORT levels compared to ready submission, and that higher levels of fight were associated with fewer numbers of Fos-ir cells in prefrontal cortex (PFC), amygdala (Am), and paraventricular nucleus (PVN) brain regions. In general terms, these findings indicate that coping behaviour deployed during social conflict influences the endocrine and neurobiological elements of the acute phase of the HPA axis response to psychosocial stress. Intruders that deploy an ‘active’ coping style including fight behaviours display significantly smaller physiological and neurobiological alterations in the acute response than intruders that deploy a ‘passive’ coping style during social conflict. These results demonstrate that the vulnerability to the effects of psychosocial stress are ameliorated by actively engaging with the perpetrator rather than passively taking the attack, and that adopting the behaviour fight is most protective. Further elucidation of the neural mechanisms that underpin the reduction in stress-induced effects is warranted.

Thesis (M.A.)--Cleveland State University, 2007. / Abstract. Title from PDF t.p. (viewed on May 8, 2008). Includes bibliographical references (p. 97-110). Available online via the OhioLINK ETD Center. Also available in print.

Thesis (Ph.D.)--Bowling Green State University, 2008. / Document formatted into pages; contains viii, 180 p. : 1 col. ill. Includes bibliographical references.

This study aimed to examine how variable exposure to language statistical patterns affects reading behaviour, specifically, eye-movements during reading. The statistical patterns of language affect how individuals store, produce and comprehend language. When reading, individuals with greater linguistic proficiency typically have been shown to rely less on language statistical information compared to less proficient readers. Based on the Lexical Quality Hypothesis, however, it was hypothesized that spelling bias, a print-specific probabilistic cue, may only be utilized for representations with sufficient strengths of representation - through increased exposure to print in individuals, or through higher frequency of occurrence for individual words, since these individuals, and these words, would be expected to have representations of high quality in the reader’s mental lexicon. Undergraduate students with varying amounts of reading experience were presented with sentences containing English noun-noun compound words that varied in spelling bias, i.e. the probability of occurring in text either as spaced (window sill) or concatenated (windowsill). Linear mixed effect multiple regression models were fitted to the eye-movement data and demonstrated that compound words presented in their more supported format - i.e. the format with the highest bias, were read faster, but that this effect was modulated by reading experience, as measured by a test of exposure to print, as well as by word frequency. Only individuals with the most reading experience, and words with the highest frequencies benefited from this facilitatory effect of bias. This distributional property can thus be used during reading, but only when individuals' lexical representations are of sufficiently high quality. The results of this study thus suggest that future research considering the relationship between linguistic properties and reading must consider individual differences in reading skill and exposure. / Thesis / Master of Science (MSc)

English Prime is a language prescription advocating the abolition of all forms of the verb “to be” from usage. Such benefits of a “to be”-less form of communication might include an increased appreciation for the essential complexity of reality and the intangibility of certain forms of knowledge. However, to date, no English Prime claims have been rigorously examined in an empirical manner. A program of research systematically assessed individual differences in the use of the verb “to be” to determine their relationship to outcomes described by English Prime scholars. Relations between English Prime violations and the following theoretically relevant measures were examined: dialectical endorsement, temporal nonlinearity, interpersonal complexity, the dialectical self, arrogance, and neuroticism. No support was found for English Prime theory via these measures. Possible reasons for such null results and implications are discussed.

<p> Discrimination in employment still exists in Canada despite legislative attempts to minimize the disparity in treatment of minorities in the workplace. This dissertation examines the possibility of whether deep-level characteristics, such as differences in behaviour, are culturally influenced.</p> <p> Organizational citizenship behaviours (OCB) in the workplace have been a popular area of study for nearly twenty years in the industrial/organizational psychology literature. Research has demonstrated that OCBs can explain variance in job performance over and above that of task performance. While much of the OCB research has focused on the antecedents of OCBs (particularly individual attributes), a handful of cross-cultural and intercultural studies have been conducted with respect to OCBs; however, the type of studies and the findings from these studies have varied widely. Cross-cultural studies have evaluated OCBs in a single non-Western culture, collectivism and individualism as within-culture individual differences and their effects on OCBs, demographic dissimilarity in teams and OCBs, the role of perceptions and the exhibition of OCBs, and the presence and structure of OCB in different countries. From these studies, one can draw few conclusions about the status of national culture as an antecedent of OCB.</p> <p> The main objectives of this study were to investigate whether OCBs are culturally determined (using Vygotsky's sociocultural theory as an underlying basis for this hypothesis and using Hofstede's cultural framework), and whether individual acculturation and gender orientation moderate this relationship. Findings reveal overall that these three variables explain little of the variance in OCBs. None of the moderation hypotheses were supported for individual-level OCBs (OCB-I) or for team-oriented OCBs (OCB-T). Power distance was the only one of Hofstede's cultural dimensions that had relationships (both negative) with OCB-I and OCB-T. Gender orientation and acculturation played more prominent roles as independent variables instead of moderators, though the coefficients were weak. The study also revealed that individual levels of acculturation to Canadian culture may be more of an influencing factor on organizational citizenship behaviours than individual scores on national dimensions. The overall findings show that cultural differences do not have much influence on the exhibition of OCBs within work teams; however, further research must be done to assess the underlying mechanisms of discrimination in the workplace.</p> / Thesis / Doctor of Philosophy (PhD)

During reading, readers engage in comprehension and metacognitive processes. When problems in integrating the current information with the situation model occur, readers tend to make regressions—backward eye movements—to find information in prior text to resolve the problem (Schotter et al., 2014). Prior research suggests that cues related to regressions are used when making metacomprehension judgments. The usage of these cues may be influenced by a person’s ability to attend to comprehension processes during reading. The current study examined the relationship between comprehension and metacomprehension processes by using regressions as a measure of online monitoring. Experiment 1 examined how attention to end-of-sentence regressions affected the usage of cues related to regressions. During reading, participants heard tones when an end-of-sentence regression was made, random tones, or did not hear tones. Participants in the random tone condition were less likely to use cues related to regressions than participants that did not hear any tones. Experiment 2 examined how awareness of comprehension difficulties and working memory affected the usage of cues related to regressions when making metacomprehension judgments. During reading, participants performed a secondary task that influenced the ability to attend to comprehension processes. Participants also completed working memory tasks. Participants in the distracted condition were less likely to use cues related to regressions than participants in the control condition. In addition, participants with low attentional control were more likely to use cues related to regressions than participants with high attentional control. The findings suggest that attention to comprehension processes and working memory play an important role in the relationship between comprehension and metacomprehension.

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