Abstract

The effects of CS intensity (70-, 80-, or 90-dB white noise) and US intensity (0.3- or 1.3-mA shock) on acquisition of shuttlebox avoidance were evaluated in a 2 × 3 complete factorial design. Acquisition was inversely related to US intensity. CS intensity was positively related to acquisition at the high US intensity but had no effect at the low US intensity. Intense CS may facilitate acquisition at high US intensities because they disrupt the incompatible response of freezing which occurs with high shock levels.

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