Abstract

Five groups of pigeons received equal numbers of presentations of a 30-sec stimulus in which keypecking was intermittently reinforced, but the duration of the blackout periods that separated these stimulus presentations was different for different groups (0 to 30 sec). Response rate during the stimulus was a direct function of the duration of the intervening blackouts. Some implications of these results for Terrace’s and Reynolds’s analyses of behavioral contrast were discussed.

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