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MID-task. Subjects first saw a CS− or a CS+ (colored rectangle). After a variable delay, a target appeared for a short time. Subjects were instructed to push a button as soon as the target appeared. During the acquisition phase in trials that began with a CS+, fast reactions led to a win. After the target had vanished, feedback about the win and the current total was displayed. During extinction, the same procedure was used but without wins after the CS+.
