Generation of black-dominant responses in V1 cortex.
J Neurosci
; 30(40): 13504-12, 2010 Oct 06.
Article
en En
| MEDLINE
| ID: mdl-20926676
ABSTRACT
Consistent with human perceptual data, we found many more black-dominant than white-dominant responses in layer 2/3 neurons of the macaque primary visual cortex (V1). Seeking the mechanism of this black dominance of layer 2/3 neurons, we measured the laminar pattern of population responses (multiunit activity and local field potential) and found that a small preference for black is observable in early responses in layer 4Cß, the parvocellular-input layer, but not in the magnocellular-input layer 4Cα. Surprisingly, further analysis of the dynamics of black-white responses in layers 4Cß and 2/3 suggested that black-dominant responses in layer 2/3 were not generated simply because of the weak black-dominant inputs from 4Cß. Instead, our results indicated the neural circuitry in V1 is wired with a preference to strengthen black responses. We hypothesize that this selective wiring could be due to (1) feedforward connectivity from black-dominant neurons in layer 4C to cells in layer 2/3 or (2) recurrent interactions between black-dominant neurons in layer 2/3, or a combination of both.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Corteza Visual
/
Vías Visuales
/
Percepción Visual
/
Potenciales de Acción
/
Visión de Colores
/
Neuronas
Límite:
Animals
Idioma:
En
Revista:
J Neurosci
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos