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Procesamiento cortical de secuencias sensoriomotrices flexibles y dependientes del contexto
Duo Xu1, Mingyuan Dong1, Yuxi Chen2
1The Solomon H. Snyder Department of Neuroscience, Krieger Mind/Brain Institute, Kavli Neuroscience Discovery Institute, Brain Science Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.
Nature
|March 10, 2022
Resumen
Los investigadores estudiaron el control cerebral de las secuencias de movimiento usando una tarea de lamer. Encontraron áreas específicas del cerebro, como la corteza somatosensorial primaria (S1TJ) y la corteza motora (M1TJ), que controlan los movimientos de la lengua, mientras que la corteza premotora maneja la planificación de secuencias.
Área de la Ciencia:
- La neurociencia
- Control del motor
- Neurociencia computacional
Sus antecedentes:
- La capacidad del cerebro para generar secuencias de movimiento flexibles y dependientes del contexto es crucial para el comportamiento.
- Comprender los mecanismos neuronales que subyacen a la generación de movimiento secuencial, especialmente con ajustes en tiempo real, sigue siendo un desafío.
Objetivo del estudio:
- Investigar las bases neuronales de la generación de movimientos secuenciales flexibles y basados en el contexto en el cerebro de los mamíferos.
- Para aclarar los roles distintos de las diferentes áreas corticales en el control y la codificación de secuencias motoras complejas.
Principales métodos:
- Desarrollo de una tarea de lamer secuencias en la que los ratones navegan por un objetivo en movimiento con su lengua.
- Utilizó optogenética de circuito cerrado y electrofisiología para registrar y manipular la actividad neuronal.
- Análisis de la codificación neuronal de los parámetros cinemáticos y las variables de comportamiento latentes.
Principales resultados:
- Las cortizas somatosensoriales primarias (S1TJ) y motoras (M1TJ) codifican y controlan con precisión la cinemática individual de la lengua.
- La corteza motora anterolateral (corteza premotora de la lengua) codifica variables abstractas como el ángulo de lamer previsto y el progreso de la secuencia.
- Se observaron señales de ramificación no específicas del movimiento tanto en la corteza motora anterolateral como en el M1TJ.
Conclusiones:
- Distintas áreas corticales desempeñan funciones especializadas en la generación de secuencias motoras flexibles.
- S1TJ y M1TJ son críticos para la ejecución de movimientos de lengua de grano fino.
- La corteza motora anterolateral contribuye a la planificación de mayor nivel y la modulación contextual de las secuencias de movimiento.
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