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First-order conditioning. Acquisition of discrimination between the CS+ and CS− auditory stimuli during the initial phase of training in rats with contralateral (▪), ipsilateral (▴), or sham (●) lesions of the BLA and LHA. Conditioned responses to the CS+ are represented by filled symbols, and conditioned responses to the CS− are represented by open symbols. Conditioned responses are expressed as the mean ± SEM percentage of time expressing food cup behavior.
