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Early-versus-late period comparison. Left, Amygdala, insula, and dACC BOLD activity as well as HR deceleration exhibited significant late period CS+ relative to CS– decrease during the acquisition block. Right, No such differences were observed for the habituation block (p = 0.72 for amygdala, 0.26 for insula, 0.78 for dACC, and 0.42 for HR).
