Abstract
The locus of conspecific odors arising from nonrewarded trials administered to rats in a straight alleyway was examined by selectively removing odors from the alley air or paper flooring. Response patterning (discrimination) established with odors undisturbed on nonrewarded trials but removed from both the paper and the air on rewarded trials was diminished, but not eliminated, by removal of odors from either the paper or the air on nonrewarded trials. These data suggest that nonreward odor is present both on the paper and in the air. Additional manipulations designed to shed light on the role of odors present following both rewarded and nonrewarded trials indicate that, although odors arising from both rewarded and nonrewarded conspecifics can control patterned responding in this task, nonreward odor may exercise the greater control. This greater control by “nonreward odor” would seem to arise from its greater salience, as inferred from using magnitude of response patterning as an index of psychological similarity.
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