Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Neural model of first-order and second-order motion perception and magnocellular dynamics
Autore:
Baloch, AA; Grossberg, S; Mingolla, E; Nogueira, CAM;
Indirizzi:
Boston Univ, Dept Cognit & Neural Syst, Boston, MA 02215 USA Boston Univ Boston MA USA 02215 ognit & Neural Syst, Boston, MA 02215 USA Boston Univ, Ctr Adapt Syst, Boston, MA 02215 USA Boston Univ Boston MA USA 02215 niv, Ctr Adapt Syst, Boston, MA 02215 USA
Titolo Testata:
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
fascicolo: 5, volume: 16, anno: 1999,
pagine: 953 - 978
SICI:
1084-7529(199905)16:5<953:NMOFAS>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPORAL VISUAL AREA; CONTRAST-MODULATED PATTERNS; RANDOM-DOT CINEMATOGRAMS; RETINAL GANGLION-CELLS; APPARENT MOTION; 2ND-ORDER MOTION; CORTICAL DYNAMICS; MACAQUE MONKEY; FUNCTIONAL-PROPERTIES; ILLUSORY CONTOURS;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
121
Recensione:
Indirizzi per estratti:
Indirizzo: Grossberg, S Boston Univ, Dept Cognit & Neural Syst, 677 Beacon St, Boston, MA 02215 USA Boston Univ 677 Beacon St Boston MA USA 02215 n, MA 02215 USA
Citazione:
A.A. Baloch et al., "Neural model of first-order and second-order motion perception and magnocellular dynamics", J OPT SOC A, 16(5), 1999, pp. 953-978

Abstract

A neural model of motion perception simulates psychophysical data concerning first-order and second-order motion stimuli, including the reversal of perceived motion direction with distance from the stimulus (Gamma display), and data about directional judgments as a function of relative spatial phase or spatial and temporal frequency. Many other second-order motion percepts that have been ascribed to a second non-Fourier processing stream can also be explained in the model by interactions between ON and OFF cells withina single; neurobiologically interpreted magnocellular processing stream. Yet other percepts may be traced to interactions between form and motion processing streams, rather than to processing within multiple motion processing streams. The model hereby explains why monkeys with lesions of the parvocellular layers, but not of the magnocellular layers, of the lateral geniculate nucleus (LGN) are capable of detecting the correct direction of second-order motion, why most cells in area MT are sensitive to both first-order and second-order motion, and why after 2-amino-4-phosphonobutyrate injectionselectively blocks retinal ON bipolar cells, cortical cells are sensitive only to the motion of a moving bright bar's trailing edge. Magnocellular LGN cells show relatively transient responses, whereas parvocellular LGN cells show relatively sustained responses. Correspondingly, the model bases itsdirectional estimates on the outputs of model ON and OFF transient cells that are organized in opponent circuits wherein antagonistic rebounds occur in response to stimulus offset. Center-surround interactions convert these ON and OFF outputs into responses of lightening and darkening cells that are sensitive both to direct inputs and to rebound responses in their receptive field centers and surrounds. The total pattern of activity increments and decrements is used by subsequent processing stages (spatially short-rangefilters, competitive interactions, spatially long-range filters, and directional grouping cells) to determine the perceived direction of motion. (C) 1999 Optical Society of America [S0740-3232(99)02105-5].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 08:58:53