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Single-condition responses in cat primary visual cortex imaged by flavoprotein autofluorescence. A, Fluorescence changes in response to a horizontal square-wave grating (inset). Bright areas correspond to increases in activity and therefore show 0° iso-orientation domains. B, Fluorescence changes in response to a vertical grating; bright regions show 90° iso-orientation domains. X's mark identical locations in A and B.
