Abstract
A wide range of spontaneous unit activity (0.1–15 spikes/sec) was observed in the caudate nucleus of rats anesthetized with urethane. All units did not respond by driven activity following stimulation of the substantia nigra. However, 71% of this population responded by significantly increased or decreased firing rates. It is suggested that unit that exhibit spontaneous activity in the caudate nucleus and which respond to stimulation of the substantia nigra have polysynaptic connections, and those units which do not discharge spontaneously but respond to stimulation of the substantia nucleus by driven action potentials have monosynaptic connetion to the caudate nucleus.
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