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Composite PEHs of normalized firing of all neurons exhibiting patterned discharges relative only to the cocaine-reinforced response during the first day of the multiple schedule. Left, PEHs show that populations of neurons exhibited NP activity relative to the reinforced response for water. Right, The same cells exhibited one of three well defined types of patterned discharges (PR, RFe, RFi) relative to the cocaine-reinforced response.
