Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
V1 RESPONSES TO TRANSPARENT AND NONTRANSPARENT MOTIONS
Autore:
QIAN N; ANDERSEN RA;
Indirizzi:
CALTECH,DIV BIOL,216-76 PASADENA CA 91125 MIT,DEPT BRAIN & COGNIT SCI CAMBRIDGE MA 02139
Titolo Testata:
Experimental Brain Research
fascicolo: 1, volume: 103, anno: 1995,
pagine: 41 - 50
SICI:
0014-4819(1995)103:1<41:VRTTAN>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
VELOCITY; MODEL; FLOW;
Keywords:
MOTION TRANSPARENCY; BEHAVING MONKEY PHYSIOLOGY; RANDOM DOT PATTERNS; COUNTERPHASE GRATINGS; DIRECTIONAL SELECTIVITY; MONKEY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
N. Qian e R.A. Andersen, "V1 RESPONSES TO TRANSPARENT AND NONTRANSPARENT MOTIONS", Experimental Brain Research, 103(1), 1995, pp. 41-50

Abstract

It is well known that a stimulus composed of two independent sets of random dots moving in opposite directions produces a percept of two overlapping transparent surfaces moving across each other, while a counterphase grating composed of two identical sine wave gratings drifting in opposite directions does not. We recorded from the directionally selective V1 cells of behaving macaque monkeys using these two types of stimuli in order to investigate the physiological basis of transparentmotion perception. Previous single-unit recording experiments from our laboratory indicated that many V1 cells respond well to transparent random dot patterns, while MT cells' responses to the same patterns are strongly suppressed in comparison with their preferred direction responses. This observation alone would seem to suggest that V1 activity could better explain transparent motion perception than MT activity. However, one could argue to the contrary based on the psychophysical observation that there is a motion threshold elevation under the transparency condition. We decided to determine the correlation between V1 activity and the transparent motion perception directly by recording from V1 cells using both transparent random dot patterns and nontransparent counterphase gratings. It is found that V1 cells on the average could not reliably tell the two types of patterns apart. Our results further the idea that additional processing beyond Vf is involved in transparent motion analysis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:19:20