Abstract
Monkeys were each irradiated with both gamma rays and neutrons, at doses varying from 70 to 557 r plus 10 to 54 rep, respectively. Irradiation preceded testing by st run. Concent 4 yr. Tests were conducted in a modified version of the Wisconsin General Test Apparatus, the stimulus objects being a red-painted triangular wood block and a red-painted circular wood block mounted vertically on red-painted rectangular wood blocks. Each monkey was tested for 50 trials or until balking occurred each day for 44 days on the same form-discrimination problem. Response to the red triangular block was consistently rewarded; response to the red circular block was consistently nonrewarded. The findings support the hypothesis of greater work decrement for normal than for previously irradiated monkeys under conditions of repetitious work. The decrement was manifested as refusal to respond. The results are interpreted as suggesting response competition for the normal monkeys between the stimuli of the test situation and stimulus features of the test situation extraneous to the solution of the experimenter-defined problem. (TCO)
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