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La retroalimentación cortico-cortical involucra a las dendritas activas en la corteza visual

Mehmet Fişek1, Dustin Herrmann2, Alexander Egea-Weiss2

  • 1Wolfson Institute for Biomedical Research and Department of Neuroscience, Physiology and Pharmacology, University College London, London, UK. fisekm@gmail.com.

Nature
|May 3, 2023
PubMed
Resumen
Este resumen es generado por máquina.

La retroalimentación neocortical de las áreas visuales superiores a la corteza visual primaria está organizada espacialmente. Esta retroalimentación facilita la percepción cuando se compensa espacialmente, integrándose de manera no lineal en las dendritas.

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Área de la Ciencia:

  • La neurociencia
  • Investigación de la corteza visual
  • Circuitos corticales

Sus antecedentes:

  • El procesamiento sensorial se basa en las vías de alimentación y retroalimentación en la neocórtex.
  • La retroalimentación proporciona información contextual, ayudando a la percepción, pero sus mecanismos son poco conocidos.

Objetivo del estudio:

  • Investigar el circuito y los mecanismos celulares de la influencia de retroalimentación desde el área visual lateromedial (LM) hasta la corteza visual primaria (V1).
  • Comprender cómo la retroalimentación organizada espacialmente contribuye a la percepción visual.

Principales métodos:

  • Mapa de conectividad óptica de largo alcance en ratones.
  • Imágenes de calcio de dos fotones en las neuronas piramidal V1.
  • La optogenética de dos fotones para activar las neuronas LM.

Principales resultados:

  • La retroalimentación de LM a V1 está organizada espacialmente: supresora cuando está alineada, facilitando cuando está desplazada en el espacio visual.
  • La retroalimentación facilitadora está integrada de manera no lineal en las dendritas del tufo apical de las neuronas piramidal V1.
  • La estimulación de las neuronas LM que se proyectan a V1 impulsa señales de calcio dendríticas específicas de la rama.

Conclusiones:

  • La conectividad de retroalimentación neocortical está organizada espacialmente y juega un papel en las interacciones contextuales.
  • La integración dendrítica no lineal de retroalimentación apoya las funciones perceptivas predictivas y cooperativas.