Learning to categorize perceptually similar stimuli can result in people becoming more sensitive to differences along perceptual dimensions that are relevant to category membership and/or less sensitive to equivalent differences along irrelevant perceptual dimensions. These effects of acquired distinctiveness and acquired equivalence may be caused…

In their seminal study of chess expertise, Simon and Chase (Chase & Simon, 1973; Simon & Chase, 1973) proposed that perceptual learning was a necessary component of skill acquisition. In their view, acquisition of skill results from the strategic use of learning at multiple levels to adaptively overcome inherent limitations. The knowledge…

Two experiments assessed the effects of extinguishing a conditioned cue on subsequent context conditioning. Each experiment used a different video-game method where sensors predicted attacking spaceships and participants responded to the sensor in a way that prepared them for the upcoming attack. In Experiment 1 extinction of a cue which signaled…

In the series of experiments supported by this grant, some fundamental characteristics of the concept of attention were explored. The first experiments were based upon the assumption that attention is limited and consequently that adult subjects may only be able to perceive a fairly restricted portion of the stimuli available to them at any moment…

Coding and recoding of hypothesis information was studied with college students and third, fifth, and seventh graders. Deficiencies in young children's ability to code, but not recode, contributes to their less efficient performance on discrimination problems. (DP)

The purpose of the two experiments was to assess the effects of two levels of stimulus redundancy and three levels of irrelevant visual stimulation on performance in a successive discrimination task and a reproduction task. The results indicate that increases in redundancy facilitated performance in the reproduction task but had no appreciable…

Investigated effects of dimensional dominance of stimuli and subject's ages in initial and shift learning of discrimination tasks. (DP)

Retardates, primary students, and college students were given either a reversal or an intradimensional shift after either a criterion of five or twenty correct on a pre-transfer problem. An automated two-choice apparatus projected planometric color and form cues from the rear onto panels that the subject was instructed to press. Both the…

The frequency theory of verbal discrimination learning makes no distinction between silent and spoken rehearsal. Further, the frequency theory predicts that the study-test method of list presentation is superior to the anticipation method. College students, performing under silent and spoken rehearsal conditions, learned 16 low-frequency…