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Pavlovian overshadowing procedures. The top panel shows the training phase for the Pavlovian group—a neutral stimulus (NS1) is presented 10 s before the unconditioned stimulus (US), and US events happen, on average, every 130 s. For the overshadowing group, everything is the same except a second, highly salient neutral stimulus (NS2) is presented simultaneously with NS1. In the test phase, NS1 is presented alone to evaluate if it will evoke a conditioned response.
