Abstract
Nine rats were tested in a choice situation in which they could obtain food pellets by barpressing at various FR schedules or take it freely from a dish. All animals were given barpress training at FR 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, and again at FR 1, and tested in the choice situation at FR 1, 5, 9, 13, 17, 21, and again at FR 1. The mean percentage of food pellets obtained by barpressing in the presence of free food decreased in a significant linear fashion from 65% at FR 1 to 11% at FR 21, and then increased to 69% for the last choice session at FR 1. A direct relationship was demonstrated between the amount of work involved in barpressing for food and the percentage of food taken by barpressing.
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