Abstract
Rats trained on a multiple fixed-ratio (FR) spaced-responding (DRL) schedule for food reinforcement were exposed to hyperbaric pressures (equivalent to 100, 200, 250, and 300 feet of sea water) breathing compressed air. High rates of responding on the FR schedule decreased under pressure and low rates on the DRL schedule increased. Amphetamine and chlordiazepoxide produced dose-related accentuation of some rate change effects at depth as well as changes in performance at depth that were not predictable from the effects of the drugs at ambient pressure.
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