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Assessment of dopamine (DA) release in the prefrontal cortex (PFC). Peristimulus time histograms illustrating effects of stimulation of the ascending DA pathway on the firing activity of PFC pyramidal neurons in (A) controls and (B) rats administered pramipexole (PPX) for 14 days. The 2 10-ms bins at time 0 represent the stimulation artifacts. SIL = absolute silence value.
