Simultaneous S-cone contrast.
Vision Res
; 42(1): 75-88, 2002 Jan.
Article
em En
| MEDLINE
| ID: mdl-11804633
ABSTRACT
Chromatic induction is the change in appearance of one light caused by a second, nearby light. We measured chromatic induction in a central test viewed within an inducing field that was varied in only short-wavelength-sensitive (S) cone stimulation. The observer matched the appearance of the central test by adjusting the chromaticity of a haploscopically presented comparison field, seen by the other eye on a dark background. When the central test weakly stimulated S cones, the S-cone level in the surround caused little change in the color appearance of the test. When the central test substantially stimulated S cones, on the other hand, the appearance of the center showed S-cone contrast raising the level of S in the surround reduced the level of S set to match the central test. Further, a surround that weakly stimulated S cones raised the matching S-cone level above that required without a surround (dark-adapted condition). These results cannot be explained by S-cone sensitivity loss or by a two-process model of adaptation. A cortical mechanism is proposed to mediate S-cone antagonism.
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Base de dados:
MEDLINE
Assunto principal:
Sensibilidades de Contraste
/
Percepção de Cores
/
Células Fotorreceptoras Retinianas Cones
Idioma:
En
Ano de publicação:
2002
Tipo de documento:
Article