Skeletal muscle effects of the chemical block of autonomic impulses and the extinction of fear.

Abstract

Confirmation was afforded the hypothesis that TEA inhibits the extinction of a conditioned emotional response (fear); it was also found that this action could be explained in terms of the effect of TEA upon the skeletal musculature. When autonomic block is produced by hexa-methonium (C6), a drug which has fewer skeletal muscle effects, no differences are found in the extinction of fear.