Abstract
Curiosity appears to be aroused by environments presenting numerous and complex stimuli to greater degree than to environments more simply structured. Satiation of exploratory activity is related to previous exposure, massing of trials and the lapse of time within a trial, but is unaffected by such variables as brightness of objects, figure-ground brightness contrast, and a 10-minutes confinement in a small box before exploration tests. It is concluded that these results are not incompatible with a two-factor theory of inhibition and that curiosity seems to be aroused primarily by "short-term novelty".

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