Escape/avoidance responding in rats depends on strain and number of inescapable preshocks.

1 January 1975

journal article
Published by American Psychological Association (APA) in Journal of Comparative and Physiological Psychology

Vol. 88 (2) , 548-553
https://doi.org/10.1037/h0076433

Abstract

2 experiments examined escape-avoidance responding in a 1-way jump box following exposure to signaled, inescapable shock. In Exp I with 24 female Long-Evans rats, the occurrence of failures to escape and to avoid was an increasing function of the number of preshocks, over a range of 75-275, with a pronounced interference effect occurring after 225 and 275 preshocks. In Exp II with 10 Long-Evans (noninbred) and 10 Fischer (inbred) female rats, there were large differences between strains in failures both to escape and to avoid following 225 preshocks. Long-Evans Ss were severely retarded, whereas Fischer Ss were disrupted only during the initial trials. Findings demonstrate the importance of strain and number of preshocks in controlling the interference effect in rats. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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