Abstract
Female hooded rats were trained to avoid shock by jumping onto a ledge in an automated avoidance box. The animals were divided into three groups (each having N=10) receiving CS-UCS intervals of 5, 17.5 and 30 sec. After attaining a learning criterion of 10 consecutive avoidance, Ss began extinction with the shocker disconnected. In ordered to hasten extinction, trials were massed for all three groups. Rats in the 5-sec CS-UCS interval group differed significantly from the other two in taking longer to learn the avoidance response and requiring more trials to extinguish. All groups differed from each other in the mean latency of avoiding during the criterial run.
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Notes
This research was supported by a grant (No. APA-253) to Morrie Baum from the National Research Council of Canada.
Black, A. H., & Richards, M. The effects of CS-UCS interval on trace avoidance conditioning in the rat. Unpublished manuscript, 1966.
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Jaffe, P.G., Baum, M. Effect of the CS-UCS interval on the acquisition of an avoidance response and on its subsequent extinction through massing of trials. Psychon. Sci. 17, 307–308 (1969). https://doi.org/10.3758/BF03336545
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DOI: https://doi.org/10.3758/BF03336545