The role of awareness in delay and trace fear conditioning in humans

From: Cognitive, Affective and Behavioral Neuroscience | Date: June 1, 2006| Author: Knight, David C; Nguyen, Hanh T; Bandettini, Peter A | Copyright information

Expression of conditional fear without awareness has been previously demonstrated during delay conditioning, a procedure in which the conditioned stimulus (CS) and unconditioned stimulus (UCS) overlap. However, less is known about the role of awareness in trace fear conditioning, where an interval of time separates the CS and UCS. The present study assessed skin conductance response (SCR) and UCS expectancy during delay and trace conditioning. UCS predictability was varied on a trial-by-trial...

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