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The effect of three dose levels of epinephrine upon extinction of an avoidance response was studied. It was hypothesized that a low dosage would prolong extinction because of increased sympathetic arousal and that this effect would be masked in the high dose group because of motor impairment. No significant effect of the hormone on trials to reach the extinction criterion was found but the high dose group showed significantly greater running times on the first five extinction trials.

The effect of epinephrine on extinction of an avoidance response