Studied the effect of blocking an avoidance response during extinction in a Mowrer-Miller box on response vigor and resistance to extinction. Found an increase in response vigor and resistance to extinction occurred for short durations of blocking time, and a reversal in this trend for prolonged blocking. Also found a transfer of the response tendencies which had become associated with frustration-drive stimuli. (PsycINFO Database Record (c) 2006 APA, all rights reserved)
