Behavior and Physiology of the Monkey 'Macaca Mulatta' Following 2500 Rads of Pulsed Mixed Gamma-Neutron Radiation
ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
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Six monkeys, which had been trained to perform a shock motivated visual discrimination task, and which had been surgically implanted to monitor aortic and venous pressures, carotid flow, heart rate and respiratory rate were irradiated with a 2500-rad midline tissue doses of mixed gamma-neutron radiation. Four of the six animals displayed an early performance decrement less than 90 percent correct responses within a few minutes following irradiation. One animal showed no performance decrement, and one animal made only five responses and then ceased to perform at all following irradiation. Animals which displayed a performance decrement suffered an acute decrease in aortic pressure. The first physiological indication of the ensuing incapacitation period was a rapid fall of diastolic pressure followed by a decrease in systolic pressure. A second period of behavioral decrement was observed in five of the six animals at approximately 40-45 minutes postirradiation. The respiratory rate was, in general, significantly increased following irradiation. No significant changes were observed in carotid flow or venous pressure.