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Titolo:
PSEUDO-INVERSE CONTROL IN BIOLOGICAL-SYSTEMS - A LEARNING MECHANISM FOR FIXATION STABILITY
Autore:
DEAN P; PORRILL J;
Indirizzi:
UNIV SHEFFIELD,DEPT PSYCHOL,WESTERN BANK SHEFFIELD S10 2TP S YORKSHIRE ENGLAND
Titolo Testata:
Neural networks
fascicolo: 7-8, volume: 11, anno: 1998,
pagine: 1205 - 1218
SICI:
0893-6080(1998)11:7-8<1205:PCIB-A>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
VESTIBULO-OCULAR REFLEX; BRAIN-STEM NEURONS; OCULOMOTOR SYSTEM; EYE-MOVEMENTS; INTERNUCLEAR NEURONS; ABDUCENS MOTONEURONS; DISCHARGE PATTERNS; NEURAL INTEGRATOR; NUCLEUS NEURONS; NETWORK MODEL;
Keywords:
RECRUITMENT; REDUNDANCY; OPTIMIZATION; GENERALIZED INVERSE; OCULOMOTOR INTEGRATOR; DISTRIBUTED MODEL; GRADIENT DESCENT; SIZE PRINCIPLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
CompuMath Citation Index
Science Citation Index Expanded
Citazioni:
52
Recensione:
Indirizzi per estratti:
Citazione:
P. Dean e J. Porrill, "PSEUDO-INVERSE CONTROL IN BIOLOGICAL-SYSTEMS - A LEARNING MECHANISM FOR FIXATION STABILITY", Neural networks, 11(7-8), 1998, pp. 1205-1218

Abstract

The problem of redundancy in motor control is common to both roboticsand biology. Pseudo-inverse control has been proposed as a solution in robotics, and appears to be used by the oculomotor system for eye position. Learning mechanisms for implementing pseudoinverse control using a distributed system of ocular motor units were investigated by modelling integrator calibration for horizontal eye movements. Ocular motoneuron (OMN) input weights were adjusted with a gradient-descent learning rule, using a retinal-slip estimate as an error signal. Firing-rate threshold only became related to motor-unit strength when a noise term was added to OMN firing rates. The learning rule suppressed those units making the largest contribution to the noise-related error, causing the strongest units to have the highest thresholds (size principle). Because the size principle and pseudo-inverse control are related, the trained system approximated pseudo-inverse control over the central +/- 35 degrees of the oculomotor range. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 19:26:29