Hypothesized that when the stimulus objects in a list of objects have class-descriptive features, these features may give rise to implicit responses which become a part of the associative stimulus event. Compared the rate of paired associates learning under two conditions of training: one favoring the formation of compound stimulus events, the other not favoring this formation. The former condition resulted in a reliably higher level of performance with a given amount of training. (PsycINFO Database Record (c) 2006 APA, all rights reserved)