Potentiation of Acoustic Startle Behavior in the Rat (Rattus norvegicus ) at the Onset of Darkness

In Experiment 1 ( N = 8) , a 20-ms light pulse, given at various times before a noise burst, inhibited reflex expression with a single trough at a lead time of 70 ms, whereas a dark pulse facilitated the reflex with two peaks at 40 and 160 ms. In Experiment 2 ( N = 18) facilitation by dark onset had...

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