Contrast-dependent red-green hue shift.
J Opt Soc Am A Opt Image Sci Vis
; 35(4): B136-B143, 2018 Apr 01.
Article
em En
| MEDLINE
| ID: mdl-29603967
ABSTRACT
On bright surrounds, red-green-balanced yellow targets become greenish brown with decreased target luminance, and red-green-balanced brown targets become reddish yellow with increased target luminance. These effects imply luminance- and/or contrast-dependent weighting of M- and L-cone signals in post-receptoral pathways. We show psychophysically that luminance contrast between the surround and the target is the primary determinant of the magnitude of red-green hue shift, requiring surround luminance at least twice the target luminance and increasing with further increases of surround/target contrast. There is a much smaller effect of absolute stimulus luminance, with dimmer stimuli showing slightly larger hue shifts. To evaluate a possible retinal origin of the changes in cone-signal weightings underlying the hue shift, we recorded spike responses from both ON- and OFF-center midget ganglion cells in peripheral primate retina. We found no evidence that the relative strength of L- and M-cone post-receptoral responses changed systematically with change of surround irradiance. Nor was there any systematic difference between ON- and OFF-subtypes. This suggests that the change in cone signal weighting occurs later in the visual system.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Células Ganglionares da Retina
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Sensibilidades de Contraste
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Percepção de Cores
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Células Fotorreceptoras Retinianas Cones
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Opsinas dos Cones
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article