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Titolo:
An associational model of birdsong sensorimotor learning I. Efference copyand the learning of song syllables
Autore:
Troyer, TW; Doupe, AJ;
Indirizzi:
Univ Calif San Francisco, Dept Psychiat, San Francisco, CA 94143 USA Univ Calif San Francisco San Francisco CA USA 94143 ancisco, CA 94143 USA Univ Calif San Francisco, Dept Physiol, San Francisco, CA 94143 USA Univ Calif San Francisco San Francisco CA USA 94143 ancisco, CA 94143 USA Univ Calif San Francisco, WM Keck Ctr Integrat Neurosci, San Francisco, CA94143 USA Univ Calif San Francisco San Francisco CA USA 94143 rancisco, CA94143 USA Univ Calif San Francisco, Sloan Ctr theoret Neurobiol UCSF, San Francisco,CA 94143 USA Univ Calif San Francisco San Francisco CA USA 94143 rancisco,CA 94143 USA
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 3, volume: 84, anno: 2000,
pagine: 1204 - 1223
SICI:
0022-3077(200009)84:3<1204:AAMOBS>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADULT ZEBRA FINCHES; ORDER-SELECTIVE NEURONS; LONG-TERM POTENTIATION; ANTERIOR FOREBRAIN; SYNAPTIC PLASTICITY; TAENIOPYGIA-GUTTATA; AXONAL CONNECTIONS; PROJECTION NEURONS; AUDITORY-FEEDBACK; NEURAL ACTIVITY;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
109
Recensione:
Indirizzi per estratti:
Indirizzo: Troyer, TW Univ Maryland, Dept Psychol, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 College Pk, MD 20742 USA
Citazione:
T.W. Troyer e A.J. Doupe, "An associational model of birdsong sensorimotor learning I. Efference copyand the learning of song syllables", J NEUROPHYS, 84(3), 2000, pp. 1204-1223

Abstract

Birdsong learning provides an ideal model system for studying temporally complex motor behavior. Guided by the well-characterized functional anatomy of the song system, we have constructed a computational model of the sensorimotor phase of song learning. Our model uses simple Hebbian and reinforcement learning rules and demonstrates the plausibility of a detailed set of hypotheses concerning sensory-motor interactions during song learning. The model focuses on the motor nuclei HVc and robust nucleus of the archistriatum (RA) of zebra finches and incorporates the long-standing hypothesis that a series of song nuclei, the Anterior Forebrain Pathway (AFP), plays an important role in comparing the bird's own vocalizations with a previously memorized song, or "template. " This "AFP comparison hypothesis" is challenged by the significant delay that would be experienced by presumptive auditory feedback signals processed in the AFP. We propose that the AFP does not directly evaluate auditory feedback, but instead, receives an internally generated prediction of the feedback signal corresponding to each vocal gesture,or song "syllable. " This prediction, or "efference copy," is learned in HVc by associating premotor activity in RA-projecting HVc neurons with the resulting auditory feedback registered within AFP-projecting HVc neurons. We also demonstrate how negative feedback "adaptation" can be used to separatesensory and motor signals within HVc. The model predicts that motor signals recorded in the AFP during singing carry sensory information and that theprimary role for auditory feedback during song learning is to maintain an accurate efference copy. The simplicity of the model suggests that associational efference copy learning may be a common strategy for overcoming feedback delay during sensorimotor learning.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 22:54:15