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Diagram showing the circuitry within the striatum. Recordings were made from cholinergic interneurons. LTP of glutamatergic EPSP and long-term facilitation of disynaptic IPSCs occur in the cholinergic interneuron. LTP of EPSP requires intracellular rise in Ca2+ concentration. LTP induction is dependent on activation of voltage-sensitive Ca2+ channels (VSCC) and DA D5 receptor. Ca2+-permeable AMPA receptors may also contribute to the LTP of EPSP in some cells.
