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BibTeX
A sequence of object-processing stages revealed by fMRI in the human occipital lobe
Human brain mapping, 1998, Vol.6 (4), p.316-328
Grill-Spector, Kalanit
Kushnir, Tammar
Hendler, Talma
Edelman, Shimon
Itzchak, Yacov
Malach, Rafael
1998
Details
Autor(en) / Beteiligte
Grill-Spector, Kalanit
Kushnir, Tammar
Hendler, Talma
Edelman, Shimon
Itzchak, Yacov
Malach, Rafael
Titel
A sequence of object-processing stages revealed by fMRI in the human occipital lobe
Ist Teil von
Human brain mapping, 1998, Vol.6 (4), p.316-328
Ort / Verlag
New York: John Wiley & Sons, Inc
Erscheinungsjahr
1998
Link zum Volltext
Quelle
Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
Beschreibungen/Notizen
Functional magnetic resonance imaging was used in combined functional selectivity and retinotopic mapping tests to reveal object‐related visual areas in the human occpital lobe. Subjects were tested with right, left, up, or down hemivisual field stimuli which were composed of images of natural objects (faces, animals, man‐made objects) or highly scrambled (1,024 elements) versions of the same images. In a similar fashion, the horizontal and vertical meridians were mapped to define the borders of these areas. Concurrently, the same cortical sites were tested for their sensitivity to image‐scrambling by varying the number of scrambled picture fragments (from 16–1,024) while controlling for the Fourier power spectrum of the pictures and their order of presentation. Our results reveal a stagewise decrease in retinotopy and an increase in sensitivity to image‐scrambling. Three main distinct foci were found in the human visual object recognition pathway (Ungerleider and Haxby [1994]: Curr Opin Neurobiol 4:157–165): 1) Retinotopic primary areas V1–3 did not exhibit significant reduction in activation to scrambled images. 2) Areas V4v (Sereno et al., [1995]: Science 268:889–893) and V3A (DeYoe et al., [1996]: Proc Natl Acad Sci USA 93:2382–2386; Tootell et al., [1997]: J Neurosci 71:7060–7078) manifested both retinotopy and decreased activation to highly scrambled images. 3) The essentially nonretinotopic lateral occipital complex (LO) (Malach et al., [1995]: Proc Natl Acad Sci USA 92:8135–8139; Tootell et al., [1996]: Trends Neurosci 19:481–489) exhibited the highest sensitivity to image scrambling, and appears to be homologous to macaque the infero‐temporal (IT) cortex (Tanaka [1996]: Curr Opin Neurobiol 523–529). Breaking the images into 64, 256, or 1,024 randomly scrambled blocks reduced activation in LO voxels. However, many LO voxels remained significantly activated by mildly scrambled images (16 blocks). These results suggest the existence of object‐fragment representation in LO. Hum. Brain Mapping 6:316–328, 1998. © 1998 Wiley‐Liss, Inc.
Sprache
Englisch
Identifikatoren
ISSN: 1065-9471
eISSN: 1097-0193
DOI: 10.1002/(SICI)1097-0193(1998)6:4<316::AID-HBM9>3.0.CO;2-6
Titel-ID: cdi_pubmedcentral_primary_oai_pubmedcentral_nih_gov_6873387
Format
–
Schlagworte
Adult
,
Biological and medical sciences
,
brain mapping
,
Brain Mapping - methods
,
Female
,
Form Perception
,
Fourier Analysis
,
Functional Laterality - physiology
,
Humans
,
Investigative techniques, diagnostic techniques (general aspects)
,
Magnetic Resonance Imaging - methods
,
Male
,
Medical sciences
,
Middle Aged
,
Nervous system
,
object recognition
,
Occipital Lobe - physiology
,
Pattern Recognition, Visual
,
Radiodiagnosis. Nmr imagery. Nmr spectrometry
,
Sensitivity and Specificity
,
visual areas
,
visual cortex
,
Visual Fields - physiology
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