[共振周波数と共振周波数を上回った高周波数界にさらされるアカゲサルのオペラント行動と直腸温] med./bio.

To study operant behavior and colonic temperature of rhesus monkeys exposed to radiofrequency fields and to determine the minimal power densities affecting performance.

The animals were trained to press a lever (observing-response) thereby producing signals that indicated availability of food. In the presence of the aperiodically appearing food signals, a detection response on a different lever was reinforced by food.

• 動物
• rhesus monkey (Macaca mulatta)
• 全身

Observing-response performance was impaired at increasingly higher power densities as frequency increased from the near-resonance 225 MHz to the above-resonance 5.8 GHz.
The threshold power density of disrupted response rate at 225 MHz was 8.1 mW/cm²; at 1.3 GHz it was 57 mW/cm², and at 5.8 GHz it was 140 mW/cm². These power densities were associated with reliable increases in colonic temperatures above sham-irradiated levels. The mean increase was in the range of 1°C, and response-rate changes were not found in the absence of concomitant temperature increases.
In these experiments elevation of colonic temperature was a much better predictor of behavioral disruption than was either the power density of the incident field or estimates of whole-body-averaged rates of energy absorption.