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El color y la orientación están codificados conjuntamente y organizados espacialmente en la corteza visual primaria
Anupam K Garg1,2,3, Peichao Li1, Mohammad S Rashid1
1The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
Science (New York, N.Y.)
|June 29, 2019
Resumen
Las neuronas de la corteza visual primaria (V1) procesan información de color y forma dentro de circuitos superpuestos. Este estudio revela que las neuronas individuales pueden codificar con precisión tanto el color como la orientación, desafiando los modelos anteriores.
Área de la Ciencia:
- La neurociencia
- Percepción visual
- Neurociencia computacional
Sus antecedentes:
- El modelo de libro de texto postula distintas vías neuronales para el procesamiento de formas y colores en la corteza visual primaria de los primates (V1).
- Las investigaciones anteriores carecían de la capacidad de probar de manera exhaustiva este modelo en un amplio espacio de estímulo.
Objetivo del estudio:
- Para investigar rigurosamente la microarquitectura funcional de V1.
- Para determinar si las neuronas V1 procesan información de color y orientación en circuitos paralelos o integrados.
- Mapear la relación entre el ajuste de color, la selectividad de orientación y la histología neuronal.
Principales métodos:
- Se utilizó la expresión estable de GCaMP6f para mejorar el etiquetado neuronal.
- Empleó imágenes de calcio de dos fotones para registrar la actividad de miles de neuronas V1.
- Probado un gran espacio de estímulo visual y cromático con resolución de una sola célula.
Principales resultados:
- Una proporción significativa de las neuronas V1 mostró una fuerte preferencia por los estímulos de color equiluminantes sobre los estímulos acromáticos.
- Estas neuronas selectivas de color también eran selectivas de orientación, lo que indica un procesamiento integrado.
- Las neuronas individuales demostraron la capacidad de codificar tanto el color como la orientación de manera inequívoca.
- Se observó una organización espacial sistemática entre el ajuste de color, la selectividad de orientación y las manchas de citocromo oxidasa.
Conclusiones:
- Las neuronas V1 están involucradas en el procesamiento mutuo de información de orientación y color dentro de circuitos superpuestos.
- Las neuronas individuales pueden codificar con precisión características visuales complejas como el color y la orientación.
- Los hallazgos desafían la estricta separación de las vías de procesamiento de color y forma en V1.
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