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Titolo:
Implications of ocular kinematics for the internal updating of visual space
Autore:
Smith, MA; Crawford, JD;
Indirizzi:
York Univ, Dept Psychol, Grp Act & Percept,Ctr Vis Res, Canadian Inst HlthRes, N York, ON M3J 1P3, Canada York Univ N York ON Canada M3J 1P3 st HlthRes, N York, ON M3J 1P3, Canada York Univ, Dept Biol, Grp Act & Percept,Ctr Vis Res, Canadian Inst Hlth Res, N York, ON M3J 1P3, Canada York Univ N York ON Canada M3J 1P3 t Hlth Res, N York, ON M3J 1P3, Canada
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 4, volume: 86, anno: 2001,
pagine: 2112 - 2117
SICI:
0022-3077(200110)86:4<2112:IOOKFT>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONKEY SUPERIOR COLLICULUS; FRONTAL EYE FIELD; PARIETAL CORTEX; OCULOMOTOR SYSTEM; MUSCLE PULLEYS; 3 DIMENSIONS; LISTING LAW; MOVEMENTS; SACCADES; NEURONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, MA York Univ, Dept Psychol, Grp Act & Percept,Ctr Vis Res, CanadianInst HlthRes, 4700 Keele St, N York, ON M3J 1P3, Canada York Univ 4700 Keele St N York ON Canada M3J 1P3 M3J 1P3, Canada
Citazione:
M.A. Smith e J.D. Crawford, "Implications of ocular kinematics for the internal updating of visual space", J NEUROPHYS, 86(4), 2001, pp. 2112-2117

Abstract

Recent studies have suggested that during saccades cortical and subcortical representations of visual targets are represented and remapped in retinalcoordinates. If this is correct, then the remapping processes must incorporate the noncommutativity of rotations. For example, our three-dimensional (3-D) simulations of the commutative vector-subtraction model of retinocentric remapping predicted centripetal errors in saccade trajectories between "remembered" eccentric targets, whereas our noncommutative model predicted accurate saccades. We tested between these two models in five head-fixed human subjects. Typically, a central fixation light appeared and two peripheral targets were flashed. With all targets extinguished, subjects were required to saccade to the remembered location of one of the peripheral targets and saccade between their remembered locations. Subjects showed minor misestimations of the spatial locations of targets, but failed to show the cumulative pattern of errors predicted by the commutative model. This experimentindicates that if targets are remapped in a retinal frame, then the remapping process also takes the noncommutativity of 3-D eye rotations into account. Unlike other noncommutative aspects of eye rotations that may have mechanical explanations, the noncommutative aspects of this process must be entirely internal.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 04:50:42