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Titolo:
Real and illusory contour processing in area VI of the primate: a corticalbalancing act
Autore:
Ramsden, BM; Hung, CP; Roe, AW;
Indirizzi:
Yale Univ, Sch Med, Neurobiol Sect, New Haven, CT 06520 USA Yale Univ NewHaven CT USA 06520 Neurobiol Sect, New Haven, CT 06520 USA
Titolo Testata:
CEREBRAL CORTEX
fascicolo: 7, volume: 11, anno: 2001,
pagine: 648 - 665
SICI:
1047-3211(200107)11:7<648:RAICPI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAT VISUAL-CORTEX; STRIATE CORTEX; MAGNIFICATION FACTOR; CROSS-CORRELATION; OCULAR-DOMINANCE; CEREBRAL-CORTEX; MACAQUE MONKEY; FIELD SIZE; V2; V1;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Roe, AW Yale Univ, Sch Med, Neurobiol Sect, 333 Cedar St, New Haven, CT 06520 USA Yale Univ 333 Cedar St New Haven CT USA 06520 Haven, CT 06520 USA
Citazione:
B.M. Ramsden et al., "Real and illusory contour processing in area VI of the primate: a corticalbalancing act", CEREB CORT, 11(7), 2001, pp. 648-665

Abstract

It is known that neurons in area V2 (the second visual area) can signal the orientation of illusory contours in the primate. Whether area V1 (primaryvisual cortex) can signal illusory contour orientation is more controversial. While some electrophysiology studies have ruled out illusory signaling in V1, other reports suggest that VI shows some illusory-specific response. Here, using optical imaging and single unit electrophysiology, we report that primate V1 does show an orientation-specific response to the 'abutting line grating' illusory contour. However, this response does not signal an illusory contour in the conventional sense. Rather, we find that illusory contour stimulation leads to an activation map that, after appropriate: subtraction of real line signal, is inversely related to the real orientation map. The illusory contour orientation is thus negatively signaled or de-emphasized in W. This 'activation reversal' is robust is not due merely to presence of line ends, is not dependent on inducer orientation, and is not due to precise position of line end stimulation of V1 cells. These data suggest a resolution for previous apparently contradictory experimental findings. We propose that the de-emphasis, of illusory contour orientation in V1 may he an important signal of contour identity and may, together with illusory signal from V2, provide a unique signature for illusory contour representation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 13:07:01