Cellular and Circuit Mechanisms Shaping the Perceptual Properties of the Primate Fovea.
Cell
; 168(3): 413-426.e12, 2017 01 26.
Article
em En
| MEDLINE
| ID: mdl-28129540
ABSTRACT
The fovea is a specialized region of the retina that dominates the visual perception of primates by providing high chromatic and spatial acuity. While the foveal and peripheral retina share a similar core circuit architecture, they exhibit profound functional differences whose mechanisms are unknown. Using intracellular recordings and structure-function analyses, we examined the cellular and synaptic underpinnings of the primate fovea. Compared to peripheral vision, the fovea displays decreased sensitivity to rapid variations in light inputs; this difference is reflected in the responses of ganglion cells, the output cells of the retina. Surprisingly, and unlike in the periphery, synaptic inhibition minimally shaped the responses of foveal midget ganglion cells. This difference in inhibition cannot however, explain the differences in the temporal sensitivity of foveal and peripheral midget ganglion cells. Instead, foveal cone photoreceptors themselves exhibited slower light responses than peripheral cones, unexpectedly linking cone signals to perceptual sensitivity.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Percepção Visual
/
Células Fotorreceptoras Retinianas Cones
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Fóvea Central
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Macaca
Limite:
Animals
Idioma:
En
Revista:
Cell
Ano de publicação:
2017
Tipo de documento:
Article