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Titolo:
Spatiotemporal frequency and direction sensitivities of human visual areasmeasured using fMRI
Autore:
Singh, KD; Smith, AT; Greenlee, MW;
Indirizzi:
Univ London, Royal Holloway Coll, Egham, Surrey, England Univ London Egham Surrey England l Holloway Coll, Egham, Surrey, England Neurol Univ Kliniken, Freiburg, Germany Neurol Univ Kliniken Freiburg Germany Univ Kliniken, Freiburg, Germany Radiol Univ Kliniken, Freiburg, Germany Radiol Univ Kliniken Freiburg Germany Univ Kliniken, Freiburg, Germany
Titolo Testata:
NEUROIMAGE
fascicolo: 5, volume: 12, anno: 2000,
pagine: 550 - 564
SICI:
1053-8119(200011)12:5<550:SFADSO>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-EMISSION TOMOGRAPHY; SUPERIOR TEMPORAL SULCUS; MACAQUE MONKEY; FUNCTIONAL-ANALYSIS; HUMAN BRAIN; RETINOTOPIC ORGANIZATION; RECEPTIVE-FIELDS; CORTEX; MOTION; MT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Singh, KD Univ Liverpool, MARIARC, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX de, England
Citazione:
K.D. Singh et al., "Spatiotemporal frequency and direction sensitivities of human visual areasmeasured using fMRI", NEUROIMAGE, 12(5), 2000, pp. 550-564

Abstract

Using functional magnetic resonance imaging (fMRI) we have studied the variation in response magnitude, in each visual area (V1-V5), as a function ofspatial frequency (SF), temporal frequency (TF) and unidirectional motion versus counterphase flicker. Each visual area was identified in each subject using a combination of retinotopic mapping fMRI and cortical flattening techniques. A drifting (or counterphasing) sinusoidal grating was used as the stimulus in a study in which we parametrically varied SF between 0.4 and 7 cycles/degree and TF between 0 and 18 Hz. For each experiment we constructed fMRI amplitude tuning curves, averaged across subjects, for each visualarea. The tuning curves that resulted are consistent with the known physiological properties of cells in the corresponding macaque visual areas, previous functional imaging studies, and in the case of V1, the psychophysically determined contrast sensitivity functions for spatial and temporal frequency. In the case of V3A, the SF tuning functions obtained were more similarto those found in single cell studies of macaque V3 rather than macaque V3A All areas showed at least a moderate preference for directed versus counterphasing motion with V5 showing the largest preference. Visual areas V1, V2, V3, and V3A showed more direction sensitivity at law spatial frequencies, while VP, V4, and V5 had the highest drifting versus counterphasing ratios for higher spatial frequencies. (C) 2000 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 07:43:33