Aversive conditioning in the rat: effects of a benzodiazepine and of an opioid agonist and antagonist on conditioned hypoalgesia and fear
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Hypoalgesia and fear co-occurred in rats trained on a heated floor and tested for their latencies to paw lick on that floor and to step down onto a nonheated floor. These responses were extinguished, suggesting a mediation by aversive conditioning processes. A... ...
