Abstract
The effects of phencyclidine (PCP) on the synaptic and direct membrane properties of neostriatal neurons were assessed using intracellular recordings from 62 neurons in rat neostriatal slices. Electrophysiological measurements were obtained before, during and after bath application of PCP. At all concentrations (1–300 μM) PCP raised current thresholds for evoking synaptic potentials and reduced excitability (the firing rate of directly evoked action potentials). In a smaller number of cells PCP (50–300 μM) increased input resistance. These effects were long-lasting and neurons did not show reversal with washes as long as 75 min. Some neurons were injected with biocytin for identification. All were medium-sized spiny type I neurons typical of rodent neostriatum.
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