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Especificidad funcional de las conexiones sinápticas locales en redes neocorticales
Ho Ko1, Sonja B Hofer, Bruno Pichler
1Department of Neuroscience, Physiology and Pharmacology, University College London, 21 University Street, London WC1E 6DE, UK.
Nature
|April 12, 2011
Resumen
Conexiones neuronales locales en el cerebro.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- La neurociencia computacional es una neurociencia computacional.
- La neurociencia de sistemas es la neurociencia de sistemas.
Sus antecedentes:
- La conectividad neuronal es crucial para el procesamiento de la información cerebral.
- La comprensión del procesamiento sensorial se basa en la vinculación de las conexiones neuronales a la función.
- La especificidad funcional a escala local de las conexiones neuronales es en gran medida desconocida.
Objetivo del estudio:
- Para determinar la conectividad sináptica entre las capas cercanas 2/3 neuronas piramidales.
- Investigar la relación entre las propiedades de respuesta neuronal y la probabilidad de conexión.
- Para descubrir la especificidad funcional en las conexiones sinápticas locales dentro de la corteza visual.
Principales métodos:
- Propiedades de respuesta caracterizadas de las neuronas de la corteza visual del ratón in vivo.
- Determinación in vitro de la conectividad sináptica entre las capas cercanas 2/3 de las neuronas piramidales.
- Análisis de la probabilidad de conexión basada en la similitud de la actividad neuronal impulsada visualmente.
Principales resultados:
- La probabilidad de conexión se correlacionó con la similitud en la actividad neuronal impulsada visualmente.
- Las neuronas con preferencias de orientación similares se conectan el doble de rápido que las neuronas con preferencias ortogonales.
- Respuestas similares a estímulos naturalistas condujeron a tasas de conexión más altas; las conexiones bidireccionales fueron más frecuentes entre neuronas correlacionadas.
Conclusiones:
- Las conexiones sinápticas locales en la corteza visual exhiben una especificidad funcional significativa.
- Es probable que existan subredes de escala fina dedicadas al procesamiento de información sensorial relacionada.
- Los hallazgos avanzan en la comprensión de cómo los circuitos neuronales procesan la entrada sensorial.
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