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

Blythe, Isobel M.; Bromley, Jane M.; Holliday, I. E. and Ruddock, K. H. (1986). The contribution of blue-sensitive cones to spatial responses of post-receptoral visual channels in man. Spatial Vision, 1(4) pp. 277–289.

DOI: https://doi.org/10.1163/156856886X00089

Abstract

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.

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