Perceptual Categorization: Connectionist Modelling and Decision Rules

Although it is currently popular to model human associative learning using connectionist networks, the mechanism by which their output activations are converted to probabilities of response has received relatively little attention. Several possible models of this decision process are considered here, including a simple ratio rule, a simple difference rule, their exponential versions, and a winner-take-all network. Two categorization experiments that attempt to dissociate these models are reported. Analogues of the experiments were presented to a single-layer, feed-forward, delta-rule network. Only the exponential ratio rule and the winner-take-all architecture, acting on the networks' output activations that corresponded to responses available on test, were capable of fully predicting the mean response results. In addition, unlike the exponential ratio rule, the winner-take-all model has the potential to predict latencies. Further studies will be required to determine whether latencies produced under more stringent conditions conform to the model's predictions.     

Negative Consequences of Felt Violations: The Deeper the Relationship,the Stronger the Reaction

Drawing from past research suggesting that high prior commitment leads to stronger reactions to unfairness in the workplace (Brockner, Tyler, & Cooper‐Schneider, 1992), we predicted that those forming relational as opposed to transactional psychological contracts would exhibit stronger detrimental effects of felt violation on job satisfaction, turnover intentions, and job performance. We also predicted a combined effect of personality and violation on these outcomes. Self‐ and supervisor‐reported data (N= 331 dyads) collected from a variety of organisations supported our predictions. In general, relational contract terms were associated with stronger violation–outcome relationships, and transactional contract terms were associated with weaker relationships. Similarly, four of the Big Five dimensions (extraversion, neuroticism, agreeableness, and openness to experience) moderated the violation–outcome relationships such that it was stronger for higher levels of these traits.