Blue-yellow opponency in primate S cone photoreceptors.
J Neurosci
; 30(2): 568-72, 2010 Jan 13.
Article
en En
| MEDLINE
| ID: mdl-20071519
ABSTRACT
The neural coding of human color vision begins in the retina. The outputs of long (L)-, middle (M)-, and short (S)-wavelength-sensitive cone photoreceptors combine antagonistically to produce "red-green" and "blue-yellow" spectrally opponent signals (Hering, 1878; Hurvich and Jameson, 1957). Spectral opponency is well established in primate retinal ganglion cells (Reid and Shapley, 1992; Dacey and Lee, 1994; Dacey et al., 1996), but the retinal circuitry creating the opponency remains uncertain. Here we find, from whole-cell recordings of photoreceptors in macaque monkey, that "blue-yellow" opponency is already present in the center-surround receptive fields of S cones. The inward current evoked by blue light derives from phototransduction within the outer segment of the S cone. The outward current evoked by yellow light is caused by feedback from horizontal cells that are driven by surrounding L and M cones. Stimulation of the surround modulates calcium conductance in the center S cone.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Retina
/
Color
/
Percepción de Color
/
Células Fotorreceptoras Retinianas Conos
Límite:
Animals
Idioma:
En
Revista:
J Neurosci
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos