A preliminary experiment established that a tone was a more salient stimulus than a light in promoting shuttlebox-avoidance behavior (Exp. 1). Exp. 2 was designed to detect the extent of overshadowing of the light by the tone. Two groups of subjects (n = 10) were confined to one side of the shuttlebox and given Pavlovian conditioning trials to either the light (control group) or a tone-light compound (experimental group). On a series of test trials the tone overshadowed the light in terms of response latency and response frequency measures in a two-way shuttlebox.
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