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Integración dendrítica no lineal de la entrada sensorial y motora durante una tarea de detección activa

Ning-long Xu¹, Mark T Harnett, Stephen R Williams

¹Howard Hughes Medical Institute, Janelia Farm Research Campus, Ashburn, Virginia 20147, USA.

|November 13, 2012

Resumen

Las neuronas utilizan dendritas activas para el procesamiento complejo. Este estudio revela una novedosa no linealidad dendrítica en las neuronas piramidal de la capa 5, que integra información sensorial y motora durante los comportamientos sensoriales activos en ratones.

Área de la Ciencia:

La neurociencia es la neurociencia.
La neurociencia computacional es una neurociencia computacional.
Procesamiento Sensorial Procesamiento Sensorial

Sus antecedentes:

Las dendritas activas mejoran las capacidades de procesamiento neuronal.
El papel de las dendritas en los cálculos de circuitos relevantes desde el punto de vista del comportamiento sigue siendo en gran medida desconocido.
Las neuronas piramidales de la capa 5 tienen estructuras dendríticas complejas que reciben entradas distintas.

Objetivo del estudio:

Investigar el papel de las dendritas neuronales en los comportamientos sensoriales activos.
Identificar nuevas no linealidades dendríticas involucradas en la integración de la información sensorial y motora.
Examinar in vivo la actividad dendrítica en las neuronas piramidal de la capa 5 durante una tarea de localización de objetos.

Principales métodos:

Imágenes de calcio de dos fotones en ratones que realizan una tarea de localización de objetos.
Registro de la actividad dendrítica en la capa 5 de las neuronas piramidal en la corteza del barril.
Analizando los potenciales de la meseta dendrítica y su dependencia de las entradas sensoriales y motoras.

Principales resultados:

Se identificó una nueva no linealidad dendrítica global en la capa 5 de las neuronas piramidales.
Se observaron señales globales de calcio de gran amplitud en las dendritas del tufo apical durante el tacto activo.
Estas señales, indicativas de potenciales de meseta dendrítica, requieren tanto entrada sensorial vibratoria como actividad de la corteza motora primaria.

Conclusiones:

Las neuronas piramidales de la capa 5 exhiben un procesamiento dendrítico no lineal de información sensorial y motora correlacionada.
Esta no linealidad dendrítica es crucial para los cálculos basados en la correlación de entrada durante la sensación activa.
Proporciona evidencia directa de los cálculos dendríticos activos en el neocórtex de los mamíferos durante el comportamiento.

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