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Titolo:
Asymmetrical activation of human visual cortex demonstrated by functional MRI with monocular stimulation
Autore:
Toosy, AT; Werring, DJ; Plant, GT; Bullmore, ET; Miller, DH; Thompson, AJ;
Indirizzi:
Inst Neurol, NMR Res Unit, London WC1N 3BG, England Inst Neurol London England WC1N 3BG R Res Unit, London WC1N 3BG, England Natl Hosp Neurol & Neurosurg, London WC1N 3BG, England Natl Hosp Neurol & Neurosurg London England WC1N 3BG n WC1N 3BG, England Univ Cambridge, Addenbrookes Hosp, Dept Psychiat, Cambridge CB2 2QQ, England Univ Cambridge Cambridge England CB2 2QQ iat, Cambridge CB2 2QQ, England
Titolo Testata:
NEUROIMAGE
fascicolo: 3, volume: 14, anno: 2001,
pagine: 632 - 641
SICI:
1053-8119(200109)14:3<632:AAOHVC>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
OCULAR DOMINANCE COLUMNS; GENERIC BRAIN ACTIVATION; MACAQUE STRIATE CORTEX; SENSORY STIMULATION; COMPLETE PATTERN; MONKEYS RETINA; OPTIC NEURITIS; GANGLION-CELL; FIELD; FMRI;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Toosy, AT Inst Neurol, NMR Res Unit, Queen Sq, London WC1N 3BG, England Inst Neurol Queen Sq London England WC1N 3BG WC1N 3BG, England
Citazione:
A.T. Toosy et al., "Asymmetrical activation of human visual cortex demonstrated by functional MRI with monocular stimulation", NEUROIMAGE, 14(3), 2001, pp. 632-641

Abstract

We have demonstrated asymmetric activation patterns in the visual corticesof normal humans who have undergone functional MRI with monocular photic stimulation. The contralateral. hemisphere is activated more strongly and toa greater spatial extent than the ipsilateral hemisphere when either eye is stimulated. This asymmetry can be explained by nasotemporal asymmetries which have been described in anatomical studies of the visual system in primates and humans. In part, the representation of the monocular crescent of the temporal hemifield of either eye, which exists only in the crossed projection, may explain this. In addition, within the binocular field, there is a biased crossed projection of nasal retinal ganglion cells which drive thecontralateral ocular dominance columns in V1. Finally, the blind spot representation in the ipsilateral visual cortex may also contribute to the observed asymmetries. Our study may in effect provide a functional correlate ofthe anatomical asymmetries that have been observed in humans and animals. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/20 alle ore 21:00:52