The objective of this article is to develop baseline models showing principal approaches to category learning. All models are based on a common memory array but vary in memory access and decision processes useful for interpretation of empirical phenomena. The main models discussed are exemplar, prototype, and feature. (JAZ)

A minimal heuristic model of human memory storage and retrievel is outlined in which there is no self-organizing ability, and in which retrieval processes are undirected in that they do not vary with the nature of information sought. The model is applied to a variety of phenomena in human learning, forgetting and retrieval. (RC)

Four possible mechanisms for short-term item recognition are distinguished. Manipulations of recency, particularly of negative probe items, provide critical tests. Two experiments were conducted using Sternberg's varied-set reaction time paradigm, coupled with procedures intended to minimize rehearsal and control the recency of probes and memory…