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La actividad en las proyecciones motor-sensoriales revela una codificación distribuida en la somatosensibilidad
Leopoldo Petreanu1, Diego A Gutnisky, Daniel Huber
1Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia 20147, USA.
Nature
|August 28, 2012
Resumen
La retroalimentación cortical a la corteza somatosensorial lleva información contextual sobre los movimientos de los bigotes y el tacto. Esto permite a los ratones integrar datos sensoriales para la localización de objetos y la navegación utilizando el tacto activo.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- El procesamiento sensorial es el procesamiento sensorial.
- Los circuitos corticales son circuitos corticales.
Sus antecedentes:
- Las proyecciones de retroalimentación cortical a las áreas sensoriales se dirigen principalmente a la capa 1 (L1).
- Se supone que la entrada L1 transmite información contextual, pero sus señales específicas no están caracterizadas.
- En el sistema somatosensorial de roedores, la retroalimentación de la corteza motora vibratoria (vM1) a la corteza somatosensorial vibratoria (vS1) puede integrar la posición del bigote con el tacto para la localización de objetos.
Objetivo del estudio:
- Para caracterizar las señales transmitidas por las proyecciones de retroalimentación L1 desde vM1 a vS1.1.
- Investigar cómo estas señales de retroalimentación contribuyen a la localización de objetos dependientes de los bigotes en ratones.
Principales métodos:
- La imagen del calcio axonal se utilizó para rastrear la actividad en los aferentes vM1-->vS1 en L1 de la corteza del barril.
- Se realizaron experimentos mientras los ratones realizaban tareas de localización de objetos dependientes de los bigotes.
Principales resultados:
- Los axones individuales en L1 representan los movimientos de los bigotes, el tacto y otras características de comportamiento.
- Un subconjunto de axones mostró actividad dependiente de la ubicación del objeto, persistiendo después del tacto.
- Estos hallazgos sugieren que la retroalimentación L1 lleva información sensorial integrada.
Conclusiones:
- Las neuronas en la corteza del barril reciben información sobre los movimientos de los bigotes y los toques a lo largo del tiempo.
- Esta información integrada es crucial para la identificación de objetos y la navegación a través del tacto activo.
- La retroalimentación L1 juega un papel clave en el procesamiento de datos sensoriales contextuales para comportamientos complejos.
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