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Los bucles de retroalimentación cortical vinculan las representaciones distribuidas de la memoria de trabajo

Ivan Voitov1,2, Thomas D Mrsic-Flogel3

  • 1Sainsbury Wellcome Centre, University College London, London, UK. i.voitov@ucl.ac.uk.

Nature
|July 27, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Los circuitos neuronales en el neocórtex mantienen la memoria de trabajo visual. La actividad de alta dimensión en áreas corticales interconectadas, específicamente el área visual AM y el área premotora M2, es crucial para esta función cognitiva.

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Área de la Ciencia:

  • La neurociencia
  • Ciencias cognitivas

Sus antecedentes:

  • La memoria de trabajo es vital para el comportamiento flexible, pero sus mecanismos de representación y mantenimiento neuronales no se comprenden completamente.
  • Estudios anteriores observaron actividad relacionada con la memoria de trabajo en varias regiones del cerebro, sin embargo, las representaciones precisas de la población neuronal siguen siendo elusivas.

Objetivo del estudio:

  • Investigar la implementación neuronal de la memoria de trabajo visual en ratones.
  • Identificar las regiones específicas del cerebro y la dinámica de la actividad de la población involucradas en el mantenimiento de las representaciones de la memoria de trabajo.

Principales métodos:

  • Los ratones realizaron una tarea de no coincidencia con la muestra retrasada (que requería memoria de trabajo) y una tarea de discriminación (que no requería memoria de trabajo).
  • Las inactivaciones optogenéticas transitorias se utilizaron para interrumpir selectivamente la actividad neuronal en áreas corticales específicas.
  • La actividad de la población se registró y analizó durante el desempeño de la tarea para identificar correlatos neuronales de la memoria de trabajo.

Principales resultados:

  • Las áreas neocorticales distribuidas, incluyendo el área visual AM y el área premotora M2, fueron requeridas selectivamente para el mantenimiento de la memoria de trabajo.
  • Se encontraron representaciones de memoria de trabajo en la actividad de la población de alta dimensión, distintas de la dinámica de baja dimensión observada durante el período de retraso.
  • La inactividad de AM o M2 interrumpió la comunicación entre áreas esencial para la memoria de trabajo.

Conclusiones:

  • Las áreas corticales interconectadas mantienen representaciones unidas y de alta dimensión críticas para la memoria de trabajo visual.
  • Los hallazgos destacan el papel de las redes corticales distribuidas y su comunicación en el apoyo a las funciones cognitivas como la memoria de trabajo.