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The Journal of Neuroscience, July 26, 2006, 26(30):7962-7973; doi:10.1523/JNEUROSCI.0178-06.2006

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Behavioral/Systems/Cognitive
Wide-Field Retinotopy Defines Human Cortical Visual Area V6

Sabrina Pitzalis,^1,2 Claudio Galletti,³ Ruey-Song Huang,⁴ Fabiana Patria,¹ Giorgia Committeri,^1,5 Gaspare Galati,^1,2,5 Patrizia Fattori,³ and Martin I. Sereno⁴

¹NeuroImaging Laboratory and ²Laboratory of Neuropsychology, Santa Lucia Foundation, Istituto di Ricovero e Cura a Carattere Scientifico, 00179 Rome, Italy, ³Department of Human and General Physiology, University of Bologna, I-40127 Bologna, Italy, ⁴Cognitive Science 0515, University of California, San Diego, La Jolla, California 92093-0515, and ⁵Department of Clinical Sciences and Bioimaging, University Gabriele d’Annunzio, 66013 Chieti, Italy

Correspondence should be addressed to Martin I. Sereno, Cognitive Science 0515, University of California, San Diego, La Jolla, CA 92093-0515. sereno{at}cogsci.ucsd.edu

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.

Key words: parieto-occipital cortex; extrastriate areas; dorsal visual stream; visual topography; cortical flattening; brain mapping

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Received Aug. 4, 2005; revised May 1, 2006; accepted May 1, 2006.

Correspondence should be addressed to Martin I. Sereno, Cognitive Science 0515, University of California, San Diego, La Jolla, CA 92093-0515. sereno{at}cogsci.ucsd.edu

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