Abstract
This experiment was conducted to examine the effects of contextual preexposure on the context-shock conditioning in rats. Seventy-two albino rats were first placed in an experimental chamber for 5 min without electric shock (contextual preexposure) for a few days (0, 1, 3 or 7 days), and then received a shock (1 mA, 2 s) with either 1 s (immediate-shock) or 180 s (delayed-shock) placement-shock internal. They were observed on the next day after the shock. The rats which experienced 3 days of preexposure exhibited freezing more frequently than those experienced 0 day and 1 day of preexposure. Seven days of preexposure decreased freezing. These results suggest the nonmonotonic effects of preexposure: the effects of facilitation and latent inhibition of conditional freezing
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