Olfactory Stimuli and the "Pseudo-Extinction" Effect

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Science  05 Dec 1969:
Vol. 166, Issue 3910, pp. 1307-1309
DOI: 10.1126/science.166.3910.1307


Continuously rewarded rats show a decrease in running speed on a runway recently traversed by other rats undergoing experimental extinction. This "pseudo-extinction" effect is caused by discriminable odors emitted by extinction subjects. These odors could be confounding variables in studies using forms of aversive stimulation.

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