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Cerebral Cortex 1996; 6:354-361
© Oxford University Press 1996

research-article

Retinotopic Organization of Human Visual Cortex: Departures from the Classical Model

Cheryl J. Aine1,, Selma Supek2, John S. George1, Douglas Ranken1, Jeffery Lewine3, John Sanders3, Elaine Best1, Wendy Tiee1, Edward R. Flynn1 and Charles C. Wood1

1Biophysics Group, Los Alamos National Laboratory Los Alamos, New Mexico 87545, 2Faculty of Science, Physics Department, University of Zagreb 10000, Zagreb, Croatia, 3Department of Radiology, University of New Mexico School of Medicine, and New Mexico Regional Federal Medical Center Albuquerque, New Mexico

Address correspondence to Cheryl J. Aine, Biophysics Group, MS D454, Los Alamos National Laboratory, Los Alamos, NM 87545

Retinotopic mapping strategies similar to those used for invasive electrophysiological studies to identify multiple visual areas in monkeys have been adapted for noninvasive studies in humans, using magnetic recordings of brain activity in conjunction with anatomical magnetic resonance imaging. The retinotopic organization of the primary visual area (V1) in the left hemisphere of human subjects was examined by presenting small patterned stimuli near the vertical and horizontal meridians in the lower right visual field. In contrast with the classical model of V1 retinotopy, our results suggest that the representation of the horizontal meridian does not necessarily correspond in a one-to-one manner with the base of the calcarine fissure and that some lower field stimuli can activate regions in the lower bank of the fissure. The results also indicate significant individual variability in the details of how V1 maps around the calcarine fissure.


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