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The contribution of blue-sensitive cones to spatial responses of post-receptoral visual channels in man

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

Psychophysical methods developed for the investigation of spatial and temporal pathways in human vision have been applied in combination with the two-colour increment threshold technique of W. S. Stiles to study the way in which signals from blue-sensitive cones are transmitted along the visual pathways. A flicker sensitive spatio-temporal filter, designated 'ST2', has been examined by background modulation methods, and spatial filters sensitive to bars of a specific width by grating adaptation methods employing dichoptic presentation of stimuli. It is shown that the blue-sensitive (π3) spectral mechanism contributes to both classes of filter response, in a manner similar to that observed for the red-sensitive spectral mechanism. The binocularly driven, bar-sensitive filters have broad-band spectral response characteristics, thus the data demonstrate that signals arising in blue-sensitive cones converge onto a luminance channel. The results of this investigation, together with those previously published for a second (STI) spatio-temporal filter, describe a variety of post-receptoral responses involving the π3 spectral mechanism.

Affiliations: 1: Departments of Physics Biophysics and Pure and Applied Biology, Imperial College, London, SW7 2BZ, UK


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