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Journal of Neuroscience, Vol 7, 913-922, Copyright © 1987 by Society for Neuroscience
Retinotopic organization of human visual cortex mapped with positron- emission tomography
PT Fox, FM Miezin, JM Allman, DC Van Essen and ME Raichle
The retinotopic organization of primary visual cortex was mapped in normal
human volunteers. Positron-emission tomographic measurements of regional
cerebral blood flow were employed to detect focal functional brain
activation. Oxygen-15-labeled water, delivered by intravenous bolus, was
used as the blood flow tracer to allow multiple stimulated- state (n = 5)
and control-state (n = 3) measurements to be acquired for each of 7
subjects. Responses were identified by applying a maximum- detection
algorithm to subtraction-format images of the stimulus- induced change in
cerebral blood flow. Response locales were described using a standardized
system of stereotactic coordinates. Changes in stimulus location (macular,
perimacular, peripheral, upper-field, lower- field) caused systematic,
highly significant changes in response locale within visual cortex.
Discrete extrastriate visual responses were also observed.
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