Changes in SD and in S!D rates during the development of an operant discrimination.

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Abstract
"An operant discrimination technique, designed to yield rate measures and to eliminate extraneous cues, is described. This procedure, which provides a wide range of durations of both the positive-stimulus (S-super(D)) periods and the negative-stimulus (S-super(Δ)) periods, with variable-interval reinforcements during the S-super(D) periods, was used in the establishment of a light-dark discrimination. Eight rats were used as Ss. During the course of the discrimination the S-super(D) rate increased to about 3.5 times its initial value, while the S-super(Δ) rate decreased to about 0.3 of its initial value. The coefficient of correlation relating S-super(D) and S-super(Δ) rates for the first 15 days of discrimination training was -0.81 . . . there was an increase in the total daily number of responses emitted during the development of the discrimination." From Psyc Abstracts 36:02:2EJ59H. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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