Abstract
One hundred and eight rats received 20 days of training of VR-10, then extinction under a wide range of drive levels. 3 measures of responding were analyzed: bar presses, time-on-bar, and efficiency (reciprocal mean response duration). During extinction, number of responses and efficiency were increasing functions of drive up to training level and decreasing functions at higher levels, efficiency being more powerful in discriminating groups. Time-on-bar was an increasing function of drive. With drives equated at acquisition level, 6 days after extinction, a spontaneous recovery test produced no significant differences in efficiency, but responses and time-on-bar yielded quadratic functions which were lowest at or near training drive level. Results were related to predictions derived from Estes'' drive-stimulus theory.

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