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Singh, K. D. ; Smith, A. T. ; Greenlee, Mark W.

Spatiotemporal Frequency and Direction Sensitivities of Human Visual Areas Measured Using fMRI

Singh, K. D., Smith, A. T. und Greenlee, Mark W. (2000) Spatiotemporal Frequency and Direction Sensitivities of Human Visual Areas Measured Using fMRI. NeuroImage 12 (5), S. 550-564.

Veröffentlichungsdatum dieses Volltextes: 16 Jan 2020 10:39
Artikel
DOI zum Zitieren dieses Dokuments: 10.5283/epub.41256


Zusammenfassung

Using functional magnetic resonance imaging (fMRI) we have studied the variation in response magnitude, in each visual area (V1–V5), as a function of spatial 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 ...

Using functional magnetic resonance imaging (fMRI) we have studied the variation in response magnitude, in each visual area (V1–V5), as a function of spatial 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 visual area. 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 similar to 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 low spatial frequencies, while VP, V4, and V5 had the highest drifting versus counterphasing ratios for higher spatial frequencies.



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Details

DokumentenartArtikel
Titel eines Journals oder einer ZeitschriftNeuroImage
Verlag:Elsevier
Band:12
Nummer des Zeitschriftenheftes oder des Kapitels:5
Seitenbereich:S. 550-564
Datum2000
InstitutionenHumanwissenschaften > Institut für Psychologie > Lehrstuhl für Psychologie I (Allgemeine Psychologie I und Methodenlehre) - Prof. Dr. Mark W. Greenlee
Identifikationsnummer
WertTyp
10.1006/nimg.2000.0642DOI
Dewey-Dezimal-Klassifikation100 Philosophie und Psychologie > 150 Psychologie
500 Naturwissenschaften und Mathematik > 570 Biowissenschaften, Biologie
StatusVeröffentlicht
BegutachtetJa, diese Version wurde begutachtet
An der Universität Regensburg entstandenJa
URN der UB Regensburgurn:nbn:de:bvb:355-epub-412569
Dokumenten-ID41256

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