Four groups of 12 rats each received constant medium size rewards of nine 45 mg Noyes pellets prior to nonrewarded (N) and nonrewarded punishment (P) (0.25 rna shock of 0.1 sec duration) trials and either large (L) size rewards of sixteen 45 mg pellets· or small (S) size rewards of two 45 mg pellets following N and P trials in a runway. Following acquisition each of the four groups was randomly subdivided into either continuous N or continuous P extinction conditions. This resulted in a two X two X two completely randomized factorial design with the variables and its levels being L and S Post N reward magnitudes, Lands' Post P reward magnitudes, and N and P extinction conditions. In acquisition, reward magnitude did not significantly affect performance. In extinction, large Post N reward magnitude produced larger resistance to extinction (Rn) than small Post N reward magnitude in the run and in the goal sections of the runway. The Post P reward magnitude did not affect performance in either acquisition or extinction. Higher Rn in the goal speed was reflected by the groups that received large Post N reward magnitude in the N extinction condition relative to the P extinction condition. The results of the present study were basically consistent with Capaldi's sequential theory with regard to Post N reward magnitude but not to Post P reward magnitude.

The objectives of this thesis are: (1) to investigate the antecedents and consequences of fairness of performance evaluation processes (procedural fairness) in the context of performance measurement, evaluation, and reward systems; and (2) to investigate the behavioural effects of reliance on multiple performance measures (RMPM) in evaluating subordinates¿ performance. In relation to the first objective, it examines whether managers¿ perceptions of procedural fairness are influenced by the form (financial or nonfinancial) of performance measures used to evaluate performance, and by goal-related variables such as participation in setting performance targets, the goal-attainment-reward link, and the specificity of goals to be achieved by managers. With regard to the consequences of procedural fairness, it examines the effects of procedural fairness on job satisfaction, performance, organisational commitment, and goal commitment, and also examines whether any such associations are direct or indirect. In relation to the second objective, it examines whether RMPM affects managerial performance or whether the effect is contingent on goal difficulty and goal specificity. To address these objectives, this thesis draws on organisational justice theory and goal theory and employs both quantitative and qualitative approaches. Quantitative data are collected using a questionnaire survey sent to managers in four organisations and qualitative data are gathered by means of interviews and focus group discussions within the organisations. The results indicate that procedural fairness is affected by participation in setting performance targets, the goal-attainment-reward link, and the specificity of goals to be achieved by managers, but not by the type of performance measure used to evaluate performance. With regard to the consequences of procedural fairness, the results indicate that: (1) the effects of procedural fairness on job satisfaction and performance are indirect and fully mediated by distributive fairness, trust, and organisational commitment; (2) the effect of procedural fairness on organisational commitment is partially mediated by distributive fairness and trust; and (3) the effect of procedural fairness on goal commitment is partially mediated by trust. Finally, the results indicate that the effect of RMPM on performance is contingent on goal specificity, but not on goal difficulty.

The present study aimed to evaluate associations between sleep duration and food-related inhibitory control and food reward in adolescents aged 12-18. Potential moderating effects of physical activity and weight status on the association between sleep, inhibitory control, and food reward were also examined. To evaluate these associations, the study employed a two-phase crossover design in which participants spent either 5 hours per night (restricted sleep) or 9 hours per night (habitual sleep) in bed for 5 nights. Participants completed a food-related inhibitory control task and a questionnaire assessing for food reward on the 6th day of each study phase. Repeated measures analyses of variance examined the effect of sleep restriction on food-related inhibitory control and food reward, and explored the moderating impact of weight status and physical activity. Adolescents performed more poorly on a food-related inhibitory control task and have heightened food reward following sleep restriction. Though no differences were noted across weight status in performance of a food inhibitory control task, adolescents with overweight/obesity demonstrated heightened food reward. An interaction between sleep duration and weight status predicted food reward, indicated that normal-weight adolescents are more susceptible to heightened food reward following sleep restriction compared to overweight/obese adolescents. Conversely, overweight/obese adolescents showed consistently high food reward with no effect of sleep duration, suggesting that they consistently view food as rewarding. These study findings may suggest that shortened sleep duration increased food reward for normal weight individuals, potentially putting them at risk for development of overweight/obesity.

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