The purpose of the present investigation was to explore the extent to which a subject's ability to conjure up an image of a visual stimulus can substitute for the presence of that stimulus when a comparison with another is required. (Author/RK)

This paper was concerned with the perceptions that can result from a change in the length of the retinal image of a line. Conditions that lead either to the perception of a line of changing length and the perception of a line of constant length undergoing covering or uncovering by another object were examined. (Author/RK)

Similarity of impairment in naturally occurring depression and laboratory-induced, learned helplessness was demonstrated in college students. (Editor)

The abstraction of prototypical information and the classification of new exemplars was investigated as a function of category size and the number of categories that had to be distinguished during learning. (Editor)

The present experiments were directed to the general question of how grouped presentation affects recall and organization. (Author)

Investigates the differences between rehearsal span and memory span and evaluates the research of Dalrymple-Alford (1967) on the part of rehearsal on reinforcing memory traces. (Author/RK)

Recognition accuracy in a tachistoscopic identification task typically declines as the size of the set from which the target was selected increases. Article investigated whether set size had its effect through selective encoding from iconic store. (Editor/RK)

Mixed lists of digit pairs and consonant pairs were presented under Sternberg's scanning paradigm. The results indicated that the subjects partitioned this material into discriminable subsets but apparently only used that structure to reduce response latency when the test probes were negative. Probe familiarity is discussed as a basis for this…

This study is the first demonstration of sequential contrast effects with human subjects during the acquisition of a discrimination without errors. Results are discussed in terms of Terrace's theory of errorless learning. (Editor/RK)

Describes a series of experiments showing that in normal subjects (a) iconic storage occurs primarily in the retina in the photoreceptors and (b) under conditions of dark pre- and postexposure fields, the icon is mainly a rod phenomenon. Draws conclusions based on these experiments, discusses previous work done by others, and attempts to reconcile…

The purpose of the present work was to investigate the relation between pattern goodness and accuracy of reproduction in backward masking. It may be hypothesized that good patterns, being easier to encode as wholes, will be reproduced more easily than poorer patterns. Four experiments were performed. (Author)