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Titolo:
Magnetic response of human extrastriate cortex in the detection of coherent and incoherent motion
Autore:
Lam, K; Kaneoke, Y; Gunji, A; Yamasaki, H; Matsumoto, E; Naito, T; Kakigi, R;
Indirizzi:
Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 4448585, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 4448585 i, Aichi 4448585, Japan Kyoto Univ, Grad Sch Human Environm Studies, Sakyo Ku, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 m Studies, Sakyo Ku, Kyoto 6068501, Japan Kyoto Univ, Grad Sch Letters, Sakyo Ku, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 h Letters, Sakyo Ku, Kyoto 6068501, Japan
Titolo Testata:
NEUROSCIENCE
fascicolo: 1, volume: 97, anno: 2000,
pagine: 1 - 10
SICI:
0306-4522(2000)97:1<1:MROHEC>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPORAL VISUAL AREA; RANDOM-DOT PATTERNS; TRANSPARENT MOTION; FUNCTIONAL-PROPERTIES; MACAQUE MONKEY; RHESUS-MONKEY; MST NEURONS; HUMAN BRAIN; OWL MONKEY; MT;
Keywords:
visual system; MT/V5; motion perception; random dot kinematogram; global motion; magnetoencephalography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Kaneoke, Y Natl Inst Physiol Sci, Dept Integrat Physiol, Myodaiji Cho, Okazaki, Aichi4448585, Japan Natl Inst Physiol Sci Myodaiji Cho Okazaki Aichi Japan 4448585
Citazione:
K. Lam et al., "Magnetic response of human extrastriate cortex in the detection of coherent and incoherent motion", NEUROSCIENC, 97(1), 2000, pp. 1-10

Abstract

Although direction selectivity is a cardinal property of neurons in the visual motion detection system, movement of numerous elements without global direction (incoherent motion) has been shown to activate human and monkey visual systems, as does coherent motion which has global direction. We used magnetoencephalography to investigate the neural process underlying responses to these types of motions in the human extrastriate cortex. Both motionswere created using a random dot kinematogram and four speeds (0, 0.6, 9.6 and 25 degrees/s). The visual stimuli were composed of two successive motions at different speeds; a coherent motion at a certain speed that changed to incoherent motion at another speed or vice versa. Magnetic responses to the change in motion consisted of a few components, the first of which was always largest. The peak latency of the first component was inversely related to the speed of the preceding motion, but for both motions it was not affected by the speed of the subsequent motion. For each subject, the estimated origin of the first component was always in the extrastriate cortex, and this changed with the speed of the preceding motion. For both motions, the location for the slower preceding motion was lateral to that for the fasterpreceding motion. Although the latency changes of the two motions differed, their overall response properties were markedly similar. These findings show that the speed of incoherent motion is represented in the human extrastriate cortex neurons to the same degree as coherent motion. We consider that the human visual system has a distinct neural mechanism to perceive random dots' motion even though they do not move in a specific direction as a whole. (C) 2000 IBRO. Published by Elsevier Science Ltd.

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Documento generato il 18/09/20 alle ore 11:12:01