THE EFFECT OF AMPHETAMINE ON THE DETECTABILITY OF SIGNALS IN A VIGILANCE TASK.
DEFENCE RESEARCH MEDICAL LABS TORONTO (ONTARIO)
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Ten mg. of dl-amphetamine sulphate or placebo were given to 56 Ss in three successive runs on a vigilance task requiring detection of a brief pause in the steady movement of a clock hand. Signals occurred at a rate of three a minute. Amphetamine had the same effect on the percentage of signals detected as on the detectability of the signals, as measured by d. The initial level was unchanged, but the decrement was reduced. No evidence of learning was found in later runs. The effects of amphetamine and knowledge of results were additive. Author