Abstract
Squads of three rats were administered rewarded and nonrewarded trials in a straight alleyway, with all three members getting the same type of goal event on a given trial. Both the membership of the squads and the position of individual rats within the squads were randomized across days. Run speeds were examined as a function of the type of goal event and the squad position. Speeds on rewarded trials did not change as a function of squad position. Speeds on nonrewarded trials decreased increasingly when rats occupied the second and third squad positions. The tendency to run relatively slowly in the third position on nonrewarded trials was inversely related to the amount of training rats had received in the first squad position. The results support the inference that odor emissions from rats on nonrewarded trials are similar from rat to rat, rather than idiosyncratic, that they accumulate, and that greater concentrations provide more effective discriminative stimuli.
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