Delayed temporal discrimination in pigeons: A comparison of two procedures

A within-subjects comparison was made of pigeons' performance on two temporal discrimination procedures that were signaled by differently colored keylight samples. During stimulus trials, a peck on the key displaying a slanted line was reinforced following short keylight samples, and a peck on the key displaying a horizontal line was reinforced following long keylight samples, regardless of the location of the stimuli on those two choice keys. During position trials, a peck on the left key was reinforced following short keylight samples and a peck on the right key was reinforced following long keylight samples, regardless of which line stimulus appeared on the correct key. Thus, on stimulus trials, the correct choice key could not be discriminated prior to the presentation of the test stimuli, whereas on position trials, the correct choice key could be discriminated during the presentation of the sample stimulus. During Phase 1, with a 0-s delay between sample and choice stimuli, discrimination learning was faster on position trials than on stimulus trials for all 4 birds. During Phase 2, 0-, 0.5-, and 1.0-s delays produced differential loss of stimulus control under the two tasks for 2 birds. Response patterns during the delay intervals provided some evidence for differential mediation of the two delayed discriminations. These between-task differences suggest that the same processes may not mediate performance in each.     

Male liberation

This article on Liberation approaches the subject from the perspective ofmen. Women have taken the lead in trying to throw off the bondage of patriarchy. Men have, for the most part, been reactors to the evolving changes. The author feels that there is a more creative role for men to play, but first, we must become more conscious of the ways in which our privileged position oppresses us. The author documents this dynamic as well as points to some possible directions for men to move in their personal and professional lives. The priority on developing collegiality and inclusiveness in our professional associations gives this subject an important place in our thinking and decisionmaking.This paper was read at a workshop on male liberation at the National A.A.P.C. Convention in San Antonio, April 30,1982.