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SUMMARY:Colour responses in the human LGN and visual cortex measured with 
 fMRI - Kathy Mullen\, McGill Vision Research\, Department of Ophthalmology
 \, McGill University
DTSTART:20060316T130000Z
DTEND:20060316T140000Z
UID:TALK4785@talks.cam.ac.uk
CONTACT:Cordula Becker
DESCRIPTION:We use high resolution fMRI (4 tesla\, 3.6 x 3.6 x 3 mm3) to r
 ecord simultaneously the responses from the human LGN and different visual
  cortical areas (V1\, V2\, V3\, VP V3A\, V4\, MT\, & VO). We use cone base
 d stimuli to activate selectively the S-cone opponent response\, originati
 ng in K cells of the geniculo-striate pathway\, the L/M cone opponent resp
 onse\, 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 su
 bcortical blue-yellow signal. We also identify key brain areas particularl
 y 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 d
 ivisions between the dorsal and ventral streams in human extra striate cor
 tex.\n
LOCATION:Seminar Room (ground floor)\, Craik-Marshall Building
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