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Titolo:
Integration and segregation of local motion signals: the role of contrast polarity
Autore:
van der Smagt, MJ; van de Grind, WA;
Indirizzi:
Univ Utrecht, Dept Comparat Physiol, NL-3584 CH Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3584 CH 3584 CH Utrecht, Netherlands Univ Utrecht, Helmholtz Inst, NL-3584 CH Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3584 CH 3584 CH Utrecht, Netherlands
Titolo Testata:
VISION RESEARCH
fascicolo: 4, volume: 39, anno: 1999,
pagine: 811 - 822
SICI:
0042-6989(199902)39:4<811:IASOLM>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
LATERAL GENICULATE-NUCLEUS; RECEPTIVE-FIELD PROPERTIES; APPARENT MOTION; VISUAL-SYSTEM; ON-CENTER; SPATIOTEMPORAL INTEGRATION; COHERENT MOTION; GLOBAL MOTION; PERCEPTION; NOISE;
Keywords:
contrast polarity; motion integration; motion segmentation; OFF detector; ON detector;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: van der Smagt, MJ Univrlandsht, Dept Comparat Physiol, Padualaan 8, NL-3584 CH Utrecht, Nethe Univ Utrecht Padualaan 8 Utrecht Netherlands NL-3584 CH
Citazione:
M.J. van der Smagt e W.A. van de Grind, "Integration and segregation of local motion signals: the role of contrast polarity", VISION RES, 39(4), 1999, pp. 811-822

Abstract

In the initial stages of visual processing in primates, more or less separated ON and OFF pathways have been shown to exist. There is ample evidence,that this separation includes the initial stages of motion processing. In the present study, experiments were conducted to investigate whether this ON versus OFF distinction persists into the integration stage of local motion information. We constructed stimuli that consisted of clusters of checks with equal contrast polarity, which could be varied in size, and compared them to stimuli with a random polarity distribution. We found that the ON versus OFF distinction remains partly intact, while interactions between the two systems are also apparent. These interactions prove to be highly correlated with the spatial structure of the stimulus. We propose a mechanism of contrast-sign specific integration of local motion signals, after which these separate ON and OFF pools engage in mutually inhibitory interactions. (C) 1998 Elsevier Science Ltd. All fights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:40:47