NEW HUMAN VO CLUSTER SUBDIVISIONS DERIVED FROM VISUAL FIELD MAPPING

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This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. INTRO Human visual cortex is organized into a set of distinct visual field maps. There is consensus on the organization of several human maps, including V1, V2, and V3, but there is disagreement about the presence and organization of visual field maps in other locations. Here, we report measurements in human ventral occipital cortex. We also describe the first coordinated measurements of color, object and face responsivity in and near these maps. METHODS We measured visual field maps in ventral occipital cortex using phase-encoded fMRI mapping methods. The rotating wedge and expanding ring stimuli consisted of 3¿ and 16¿ black and white, drifting radial checkerboard patterns. Temporal phase-encoded BOLD signals were analyzed with an automated, atlas-fitting algorithm to define the visual area boundaries. Color, face, and object-selective responses were measured by performing separate color-luminance and object-face exchange experiments.