"The purpose of this study was to test deductions from reinforcement learning theory concerning visual recognition thresholds. The general hypothesis was that the recognition of nonsense syllables previously associated with electric shock will occur more readily if the experimental conditions enable S to escape from the shock than if escape is not possible . . … The results suggest that the factor of escapability from shock in a noxious situation is a significant determinant of subsequent recognition thresholds of stimuli associated with that situation." (PsycINFO Database Record (c) 2006 APA, all rights reserved)