Abstract
Three experiments on rats' reactions to conspecific muscle homogenate, blood, and brain homogenate are reported. In Expt. I, rats were trained to traverse a runway for water reinforcement. Then separate groups were tested with the tissue preparations applied to the runway. Fright reactions were found when muscle and blood were encountered, but not when brain was used. In Expts. II and III, paired-comparison preference tests were made with these tissues and water. Less time was spent on surfaces treated with muscle and blood than on those treated with brain or water. No differences were found between muscle and blood, nor between brain and water. It was concluded that muscle and blood from injured rats contain a substance which elicits fright reactions.
Published Version
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