"Effects of reinforcement delays on procrastination in pigeons" by Megan Elizabeth Meginley

Semester

Summer

Date of Graduation

2001

Document Type

Thesis

Degree Type

MA

College

Eberly College of Arts and Sciences

Department

Psychology

Committee Chair

Kennon A. Lattal.

Committee Co-Chair

Michael Perone

Committee Member

Cheryl McNeil

Abstract

Procrastination has been defined as the choice of a larger, later work requirement over a smaller, sooner work requirement. In one experiment (Mazur, 1996), pigeons chose a later-onset work requirement over an earlier-onset work requirement when work requirements were identical and reinforcement was at an equal delay from the choice point. In Phase I of the present experiment, reinforcement was delivered to pigeons immediately upon completion of either an early- or a late-onset work requirement in the terminal links of a concurrent-chains schedule. The early-onset work requirement was preferred. This preference held in Phase 2, when a delay to reinforcement was added, following completion of the early-onset work requirement. These results suggest that when work requirements produce more immediate reinforcement, relative to the choice point, they will be preferred, even when there is a shorter delay to their onset.

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