Abstract
This paper reviews progress since the author's previous writings in three areas. In escape training, the preparatory‐response explanation of bar holding still appears to be valid. In avoidance, the newer safety‐signal version of two‐factor theory has much to recommend it and readily incorporates Anger's conditioned aversive temporal stimuli formulation. Shock‐density reduction is rejected as a substitute for two‐factor theory. Finally, criticisms of the avoidance interpretation of punishment are answered and recent empirical data are cited in its support.

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