Olfactory stimuli and the "pseudo-extinction" effect.
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.
D000818:Animals; D003213:Conditioning, Psychological; D004192:Discrimination, Psychological; D005108:Extinction, Psychological; D009043:Motor Activity; D009812:Odorants; D051381:Rats; D012903:Smell