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Colour responses in the human LGN and visual cortex measured with fMRI

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We use high resolution fMRI (4 tesla, 3.6×3.6×3 mm3) to record simultaneously the responses from the human LGN and different visual cortical areas (V1, V2, V3, VP V3A , V4, MT, & VO). We use cone based stimuli to activate selectively the S-cone opponent response, originating in K cells of the geniculo-striate pathway, the L/M cone opponent response, based in the P cells, and an achromatic response (M & P cells). We find that the responses of the blue-yellow color pathway are selectively enhanced between the LGN and cortex, which may compensate for the weak subcortical blue-yellow signal. We also identify key brain areas particularly responsive to colour (V1 & area VO anterior to V4), those particularly responsive to achromatic contrast (V3A & MT), and those that respond to all types of contrast (V2, V3, VP, V4). This reveals major functional divisions between the dorsal and ventral streams in human extra striate cortex.

This talk is part of the Craik Club series.

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