Two retinotopic visual areas in human lateral occipital cortex.
We describe two visual field maps, lateral occipital areas 1 (LO1) and 2 (LO2), in the human lateral occipital cortex between the dorsal part of visual area V3 and visual area V5/MT+. Each map contained a topographic representation of the contralateral visual hemifield. The eccentricity representations were shared with V1/V2/V3. The polar angle representation in LO1 extended from the lower vertical meridian (at the boundary with dorsal V3) through the horizontal to the upper vertical meridian (at the boundary with LO2). The polar angle representation in LO2 was the mirror-reversal of that in LO1. LO1 and LO2 overlapped with the posterior part of the object-selective lateral occipital complex and the kinetic occipital region (KO). The retinotopy and functional properties of LO1 and LO2 suggest that they correspond to two new human visual areas, which lack exact homologues in macaque visual cortex. The topography, stimulus selectivity, and anatomical location of LO1 and LO2 indicate that they integrate shape information from multiple visual submodalities in retinotopic coordinates.
Larsson
Jonas
J
Department of Psychology and Center for Neural Science, New York University, New York, New York 10003, USA. jonas@cns.nyu.edu
Heeger
David J
DJ
D001931:Brain Mapping / Q000379:methods; D006801:Humans; D009039:Motion Perception / Q000502:physiology; D009778:Occipital Lobe / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D012160:Retina / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology; D014794:Visual Fields / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology*