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Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
Published on: September 5, 2018
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La topología de las entradas ON y OFF en la corteza visual permite una arquitectura de columnas invariante
Kuo-Sheng Lee1,2, Xiaoying Huang1, David Fitzpatrick1
1Department of Functional Architecture and Development of Cerebral Cortex, Max Planck Florida Institute for Neuroscience, Jupiter, Florida 33458, USA.
Nature
|April 28, 2016
Resumen
Los investigadores mapearon los circuitos de la corteza visual en las musarañas, revelando cómo convergen las vías de encendido y apagado. Esta convergencia crea una estructura de campo receptivo consistente, lo que permite un mapeo preciso de la orientación y el espacio visual.
Área de la Ciencia:
- La neurociencia
- Investigación de sistemas visuales
- Circuitos corticales
Sus antecedentes:
- Los circuitos de la corteza visual integran vías ON (responsivas a la luz) y OFF (responsivas a la oscuridad) para la representación del estímulo.
- Los mecanismos precisos de esta convergencia ON-OFF y sus limitaciones topográficas no se comprenden completamente.
Objetivo del estudio:
- Investigar las características novedosas de la convergencia de la vía ON-OFF en la corteza visual de la musaraña.
- Comprender cómo esta convergencia contribuye al mapeo topográfico de la orientación y el espacio visual.
Principales métodos:
- Utilizó imágenes de dos fotones de señales de calcio GCaMP6 para mapear campos receptivos de las neuronas de la capa 2/3.
- Analizó las relaciones espaciales y la progresión visuotópica de los subcampos ON y OFF.
Principales resultados:
- Se han identificado relaciones topográficas distintas entre los subcampos ON/OFF y los mapas visuales de espacio/orientación.
- Los subcampos OFF mostraron una progresión visuotópica compacta, mientras que los subcampos ON exhibieron una dispersión más amplia y un desplazamiento específico de orientación.
- Demostró una estructura de campo receptiva agregada invariante con un centro dominado por OFF y flancos dominados por ON.
Conclusiones:
- La disposición distinta de las entradas ON y OFF garantiza la continuidad en la orientación y el mapeo visual del espacio.
- Esta convergencia facilita la generación de un mapa columnar de la fase espacial absoluta en la corteza visual.
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