This thesis aimed to develop a paradigm for the study of anomaly handling and to investigate the factors that influence success in detecting and classifying anomalies. A simulated anomaly-handling environment was created to mimic an intelligence analysis task in a security setting. A series of experiments was designed to test hypotheses concerning sources of difficulty in detecting potential anomalies and making decisions about appropriate classifications of potentially anomalous events. Results across all experiments showed that complex problems, representing anomalies, were more difficult to solve than simple problems, and that this poor performance was consistent with the use of suboptimal strategies based on recognition of perceptual characteristics rather than inferences drawn from available data. Performance on complex problems was reduced still further when participants were exposed to trials that established a mental set. However, performance was improved when participants were given feedback on the correctness of their responses to each trial, which eliminated the negative effects of exposure to mental set. Another factor that impacted on successful decision-making was the cost of making errors. When participants were faced with a penalty for making incorrect decisions, solution rates improved compared with when performance was not related to reward. This has consequences for anomaly handling industries where the consequence of failure of often high. Unexpectedly, a number of the results indicated that there are situations where mental set may confer a benefit to decision making in a task of anomaly categorisation. Given the dominance of recognition-based strategies, it appears that mental set can refine the detection of perceptually relevant patterns, which can signal sudden changes in pattern that can lead to a switch from recognition-based to inferential task solution strategies. Overall, the merits for the use of simulated environments in critical decision making areas are discussed, and the contributory factors towards successful anomaly handling are analysed.

Section A provides a review of the emotional and experiential avoidance literature with a focus on determining the proximal psychological factors that might lead individuals to avoid experiencing feelings. This section highlights the importance of beliefs, judgements and appraisals about the acceptability of negative emotions, as well as fears about the physical, psychological and social consequences of tolerating internal distress as potential drivers of emotional avoidance. Section B describes the development of a new scale to identify and measure beliefs about experiencing difficult emotions. The paper gives a background and rationale for the study and outlines the methodology that was utilised to construct and psychometrically evaluate the Beliefs about Difficult Feelings Scale (BDFS). 304 participants completed the scale online along with related measures. The six clusters of beliefs that emerged from a factor analysis of 90 pilot items include Catastrophic Beliefs, Emotions are Useful, Negative Evaluation from Others, Emotions are Exhausting/Frustrating, Emotions are Transient and Emotions are Pointless. The psychometric properties of the final 29-item BDFS are promising. The new measure demonstrated good internal consistency, test-retest reliability and construct validity, however further psychometric evaluation is needed on new samples to verify these preliminary findings

The use of neuropsychological tests with regards to language and culture is a relatively under researched area. Previous research has found that cultural familiarity with test-items is important for minimising differences between groups and that completing tests in a second language can increase differences between groups on both language- and performance-based tests. An exploratory mixed methods design was used for this study. Participants were 46 participants with English as a first language (L1) and 23 participants with English as a second language (L2). The L1 and L2 participants differed only on the Language index of the SPANS, with L1 participants scoring significantly higher. Participants whose first language is not English reported generally that the test experience was good and the language used in the testing was clear. They reported some anxiety and worry in relation to memory and numbers. The results of this study support previous research which suggests that language may influence performance on language based neuropsychological tests as well as support for a need for culturally familiar test-items. As there were minimal differences between the two groups this is support for the SPANS’s use with the tested population with caution given to interpretation of the language index.

Section A presents the hypothesis that attachment representations determine individuals’ capacities for empathy, which is necessary for sensitive and responsive caregiving. It reviews the evidence pertaining to whether this hypothesis applies within the context of employed caregivers caring for adults with learning disabilities. The evidence is considered in a stepwise fashion, based on four literature searches. The paper concludes by considering the implications of this literature for clinical practice and future research. Section B is an empirical research paper which describes the development of a new questionnaire aiming to measure employed carers’ empathy towards people with learning disabilities. It describes how investigation of the questionnaire’s factor structure illuminated the salient processes that may influence empathy in this specific relational context. It presents evidence of the questionnaire’s construct validity, internal reliability and test-retest reliability. The results are linked to existing literature and recommendations for clinical practice are made. Limitations of the study and directions for future research are considered.

This study aimed to create the first measure of risk for UK gang-affiliation. A pilot stage invited gang affiliated and non-gang affiliated participants between the ages of 16–25 to retrospectively self-report on 58 items of risk exposure at the age of 11. Based on performance of these items, a 26-item measure was developed and administered to a main study sample (n=185) of gang affiliated and non-gang affiliated participants. Categorical Principal Component Analysis was applied to data, yielding a single-factor solution (historic lack of safety and current perception of threat). A 15-item gang-affiliation risk measure (GARM) was subsequently created. The GARM demonstrated good internal consistency, construct validity and discriminative ability. Items from the GARM were then transformed to read prospectively, resulting in a test measure for predictive purposes (T-GARM). However, the T-GARM requires further validation regarding its predictive utility and generalisability.

It is often reported that after amputation people experience "a constant or inconstant ... sensory ghost ... faintly felt at time, but ready to be called up to [their] perception" (Mitchell, 1866). Perceptual abnormalities have been highlighted in amputees, such as sensations in the phantom when being stroked elsewhere (Ramachandran et al., 1992) or when observing someone in pain (Giummarra and Bradshaw, 2008). This thesis explored the perceptual changes that occur following amputation whist focusing on pain, vision and touch. A sample of over 100 amputees were recruited through the National Health Service. Despite finding no difference in phantom pain based on physical amputation details or nonpainful perceptual phenomena, results from Paper 1 indicated that phantom pain may be more intense, with sensations occurring more frequently, in amputees whose pain was triggerinduced. The survey in Paper 2 identified a group of amputees who in losing a limb acquired mirror-touch synaesthesia. Higher levels of empathy found in mirror-touch amputees might mean that some people are predisposed to develop synaesthesia, but that it takes sensory loss to bring dormant cross-sensory interactions into consciousness. Although the mirror-system may reach supra-threshold levels in some amputees, the experiments in Paper 3 suggested a relatively intact mirror-system in amputees overall. Specifically, in a task of apparent biological motion, amputees showed a similar, although weaker, pattern of results to normalbodied participants. The results of Paper 4 showed that tactile spatial acuity on the face was also largely not affected by amputation, as no difference was found between the sides ipsilateral and contralateral to the stump. In Paper 5 cross-modal cuing was used to investigate whether referred tactile sensations could prime a visually presented target in space occupied by the phantom limb. We conclude that perception is only moderately affected in most amputees, but that in some the sensory loss causes normally sub-threshold processing to enhance into conscious awareness.