Wide-Field Retinotopy Defines Human Cortical Visual Area V6

The retinotopic organization of a newly identified visual area near the midline in the dorsalmost part of the human parieto-occipital sulcus was mapped using high-field functional magnetic resonance imaging, cortical surface-based analysis, and wide-field retinotopic stimulation. This area was found...

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Bibliographic Details
Published in:The Journal of neuroscience 2006-07, Vol.26 (30), p.7962-7973
Main Authors: Pitzalis, Sabrina, Galletti, Claudio, Huang, Ruey-Song, Patria, Fabiana, Committeri, Giorgia, Galati, Gaspare, Fattori, Patrizia, Sereno, Martin I
Format: Article
Language:English
Subjects:
Animals
Brain Mapping
Evoked Potentials, Visual - physiology
Humans
Macaca
Magnetic Resonance Imaging
Nerve Net - physiology
Occipital Lobe - physiology
Parietal Lobe - physiology
Photic Stimulation - methods
Primates
Visual Cortex - physiology
Visual Fields - physiology
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Summary:The retinotopic organization of a newly identified visual area near the midline in the dorsalmost part of the human parieto-occipital sulcus was mapped using high-field functional magnetic resonance imaging, cortical surface-based analysis, and wide-field retinotopic stimulation. This area was found in all 34 subjects that were mapped. It represents the contralateral visual hemifield in both hemispheres of all subjects, with upper fields located anterior and medial to areas V2/V3, and lower fields medial and slightly anterior to areas V3/V3A. It contains a representation of the center of gaze distinct from V3A, a large representation of the visual periphery, and a mirror-image representation of the visual field. Based on similarity in position, visuotopic organization, and relationship with the neighboring extrastriate visual areas, we suggest it might be the human homolog of macaque area V6, and perhaps of area M (medial) or DM (dorsomedial) of New World primates.
ISSN:0270-6474
1529-2401
DOI:10.1523/JNEUROSCI.0178-06.2006