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J Neurophysiol 73: 2602-2607, 1995;
0022-3077/95 $5.00
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Journal of Neurophysiology, Vol 73, Issue 6 2602-2607, Copyright © 1995 by APS

ARTICLES

Electrical stimulation in forebrain nuclei elicits learned vocal patterns in songbirds

D. S. Vicario and H. B. Simpson
Rockefeller University, New York, New York 10021, USA.

1. Microstimulation (trains of biphasic current pulses at 50-400 Hz lasting 2-4 s) was delivered unilaterally to known vocal control areas in the brains of zebra finches and canaries to elicit vocalizations. 2. Simple vocalizations were elicited from the midbrain, and the lowest thresholds were obtained from the dorsomedial nucleus of the intercollicular complex (DM). 3. Vocalizations elicited from forebrain vocal control nuclei higher vocal center (HVC) and robustus archistriatalis (RA) were complex, with features specific not only to the species, but to the individual bird's own learned song. 4. Complex acoustic features depended on innervation of the bird's vocal organ and were lost when the tracheosyringeal nerve was cut. 5. We suggest that stimulation of the forebrain vocal pathway activates a dedicated neural circuit that generates the temporal structure of song and whose specific pattern of activity is programmed during sensorimotor learning in each individual.


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