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Mean conditioned skin conductance responses. (A) The Black-Shocks-First (BSF) group exhibited intact learning but impaired reversal, as evidenced by enhanced SCRs to CS1 versus CS2 during Acquisition, but no difference between CS1 and CS2 during Reversal. (B) The White-Shocks-First (WSF) group showed intact learning and reversal. Error bars reflect standard errors; ** = p < .01.
