Cerebral Cortex Advance Access originally published online on December 16, 2006
Cerebral Cortex 2007 17(10):2293-2302; doi:10.1093/cercor/bhl138
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Receptive Fields in Human Visual Cortex Mapped with Surface Electrodes
1 Department of Neurosurgery, Baylor College of Medicine, One Baylor Plaza, S-603, Houston, TX 77030, USA, 2 Department of Neuroscience and Howard Hughes Medical Institute, Baylor College of Medicine, One Baylor Plaza, S-603, Houston, TX 77030, USA, 3 Department of Neuroscience, University of Minnesota, 6-145 Jackson Hall, 321 Church Street, Minneapolis, MN 55455, USA
Address correspondence to Daniel Yoshor, Department of Neurosurgery, Baylor College of Medicine, One Baylor Plaza, S-603, Houston, TX 77030, USA. Email: dyoshor{at}bcm.edu.
Most of our understanding of the functional organization of human visual cortex comes from lesion and functional imaging studies and by extrapolation from results obtained by neuroanatomical and neurophysiological studies in nonhuman primates. Although some single-unit and field potential recordings have been made in human visual cortex, none has provided quantitative characterization of spatial receptive fields (RFs) of individual sites. Here we use subdural electrodes implanted for clinical purposes to quantitatively measure response properties in different regions of human visual cortex. We find significant differences in RF size, response latency, and response magnitude for sites in early visual areas, versus sites in later stages of both the dorsal and ventral streams. In addition, we use this technique to estimate the cortical magnification factor in early human visual cortex. The spatial and temporal resolution of cortical surface recordings suggest that this technique is well suited to examine further issues in visual processing in humans.
Key Words: electrophysiology • human • latency • magnification factor • retinotopy
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