Abstract
Rats were given trials in rotating order in the straight runway with a double alternation pattern of reward and nonreward. For half the subjects, a fan continuously exhausted the air in the apparatus in order to neutralize between-trial odors associated with reward and nonreward. Appropriate double-alternation patterning developed in the fan-off group but not the fan-on group. A transfer phase showed that shifting from fan-off to fan-on immediately disrupted patterning. An extinction phase showed that, the longer the fan-off training, the less the subsequent resistance to extinction. The results supported the hypothesis that differential conspecific odors on rewarded and nonrewarded trials provide cues for differential responding.
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