title: A dim view of M-cone onsets.
abstract: We investigated the brightness (i.e., perceived luminance) of isolated L- and M-cone pulses to seek a perceptual correlate of our previous reports that M-on electroretinograms resemble L-off responses, implying the operation of post-receptoral opponent processing. Using triple silent substitutions, cone increments were generated in a 4-primary ganzfeld, masked by random positive or negative luminance bias. The results show that M-cone increments decrease in brightness, while L-cone increments increase. These differences became smaller as field size reduced; this was not eccentricity or area dependent. We speculate about early retinal input into brightness perception.
authors.forename: Neil R A
authors.initials: NR
authors.lastname: Parry
authors.forename: Declan J
authors.initials: DJ
authors.lastname: McKeefry
authors.forename: Jan
authors.initials: J
authors.lastname: Kremers
authors.forename: Ian J
authors.initials: IJ
authors.lastname: Murray
mesh_terms: D006801:Humans; D008027:Light; D010775:Photic Stimulation; D011601:Psychophysics; D017949:Retinal Cone Photoreceptor Cells / Q000166:cytology* / Q000528:radiation effects*; D014796:Visual Perception / Q000528:radiation effects