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Titolo:
Visuomotor properties of corticotectal cells in area 17 and posteromedial lateral suprasylvian (PMLS) cortex of the cat
Autore:
Weyand, TG; Gafka, AC;
Indirizzi:
Louisiana State Univ, Hlth Sci Ctr, Dept Cell Biol & Anat, New Orleans, LA70112 USA Louisiana State Univ New Orleans LA USA 70112 t, New Orleans, LA70112 USA
Titolo Testata:
VISUAL NEUROSCIENCE
fascicolo: 1, volume: 18, anno: 2001,
pagine: 77 - 91
SICI:
0952-5238(200101/02)18:1<77:VPOCCI>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRONTAL EYE FIELD; SUPERIOR COLLICULUS; VISUAL-CORTEX; CORTICAL AREAS; ALERT CAT; NEURONS; MOVEMENTS; ORGANIZATION; MONKEY; SYSTEM;
Keywords:
saccades; superior colliculus; visual suppression; oscillatory activity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Weyand, TG Louisiana State Univ, Hlth Sci Ctr, Dept Cell Biol & Anat, 1910Perdido St, New Orleans, LA 70112 USA Louisiana State Univ 1910 Perdido StNew Orleans LA USA 70112 A
Citazione:
T.G. Weyand e A.C. Gafka, "Visuomotor properties of corticotectal cells in area 17 and posteromedial lateral suprasylvian (PMLS) cortex of the cat", VIS NEUROSC, 18(1), 2001, pp. 77-91

Abstract

We studied the visuomotor activity of corticotectal (CT) cells in two visual cortical areas [area 17 and the posteromedial lateral suprasylvian cortex (PMLS)] of the cat. The cats were trained in simple oculomotor tasks, andhead position was fixed. Most CT cells in both cortical areas gave a vigorous discharge to a small stimulus used to control gaze when it fell within the retinotopically defined visual field. However, the vigor of the visual response did not predict, latency to initiate a saccade, saccade velocity, amplitude, or even if a saccade would be made, minimizing any potential role these cells might have in premotor or attentional processes. Most CT cells in both areas were selective fur direction of stimulus motion, and cells in PMLS showed a direction preference favoring motion away from points of central gaze. CT cells did not discharge with eye movements in the dark. During eye movements in the light, many CT cells in area 17 increased their activity. In contrast, cells in PMLS, including CT cells, were generally unresponsive during saccades. Paradoxically, cells in PMLS responded vigorouslyto stimuli moving at saccadic velocities, indicating that the oculomotor system suppresses visual activity elicited by moving the retina across an illuminated scene. Nearly all CT cells showed oscillatory activity in the frequency range of 20-90 Hz, especially in response to visual stimuli. However, this activity was capricious; strong oscillations in one trial could disappear in the next despite identical stimulus conditions. Although the CT cells in both of these regions share many characteristics, the direction anisotropy and the suppression of activity during eye movements which characterize the neurons in PMLS suggests that these two areas have different roles in facilitating perceptual/motor processes at the level of the superior colliculus.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/05/20 alle ore 14:56:28