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All participants, prior to any drug administration, showed successful discrimination between the reinforced CS+ and non-reinforced CS−.
CSH = conditioned stimuli habituation; ACQ = acquisition; CS+ = reinforced conditioned stimuli; CS− = non-reinforced conditioned stimuli; fear-potentiated startle = [mean startle magnitude to CS] – [mean startle magnitude to noise alone]; μV = microvolts; ** = significant block × CS type interaction, p = 0.008.
