Stimulus preexposure and discrimination learning by domestic chicks: Effect of varying interstimulus time

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Conducted a series of experiments with a total of 199 Ross strain chicks in which groups of Ss were preexposed to moving objects on Days 1–5 after hatching. Only 1 object was visible at a time, and the time between the appearance of one stimulus and the immediately succeeding appearance of the other was called the “interonset time.” Ss which had been preexposed to both discriminanda in rapid alternation (interonset time of 1/4 min) learned a subsequent discrimination task more slowly than Ss familiar with neither stimulus; Ss preexposed to both discriminanda at separate times (interonset time of 30 min) learned the discrimination faster than Ss familiar with neither stimulus. The evidence suggests that the proportions of slow-learning and fast-learning Ss in a group were changed by varying interonset time. (25 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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