Abstract
A procedure of presenting changes in CS intensity with variable background intensities, as developed by Grice, Masters, & Kohfeld (1966), was used in a shuttle avoidance task with 13 rats as Ss. Superior performance resulted from increases in stimulus intensity in comparison to decreases. Amount of change in stimulus intensity (10 or 20 dB) was positively related to performance only when the change involved increases in the intensity of stimulation.
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