Rats trained to press a lever in a microwave-transparent operant chamber on three schedules of reinforcements; fixed-ratio (FR), variable-interval (VI), and differential reinforcement of low rates (DRL), were exposed to high power microwave fields (1.25 GHz, 1-MW peak-power, 10 ps pulse width) for 10 min. Dose levels (SAS) were set to 5.0, 7.5 and 10.0 kJkg, by adjusting the pulse repetition rates. At high dose levels, rats' overall response rates were decreased by 30 -40% relative to their baseline rates.However, due to the specific requirements of the schedules, only FR animals which needed a high number of responses, collected fewer reinforcements at the highest dose level.
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