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Un mapa colícular para el control de la lengua guiado por tacto
Brendan S Ito1, Yongjie Gao2, Brian Kardon2
1Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, USA. itobrendan@gmail.com.
Nature
|January 1, 2025
Resumen
Los comportamientos orientados a objetivos precisos dependen de la integración del tacto con la posición del cuerpo. El colículo superior lateral (latSC) es crucial para el control dinámico de la lengua guiado por el tacto, actuando como un mapa mecanicosensorial.
Área de la Ciencia:
- La neurociencia
- Integración sensorial y motora
- Comportamiento animal
Sus antecedentes:
- Los comportamientos dirigidos a objetivos requieren la integración de información táctil con la propriocepción y el movimiento.
- El control dinámico de la lengua durante comportamientos como masticar y hablar se basa en eventos táctiles precisos, pero los circuitos neuronales subyacentes son desconocidos.
Objetivo del estudio:
- Investigar los circuitos neuronales responsables del control dinámico de la lengua guiado por el tacto.
- Determinar el papel del colículo superior lateral (latSC) en la integración de la información táctil y propioceptiva para el movimiento de la lengua.
Principales métodos:
- Videografía de alta velocidad para analizar la cinemática lingüística tridimensional en ratones.
- Experimentos de fotoinactivación para evaluar la función de las áreas corticales y subcorticales.
- Registros electrofisiológicos para caracterizar la actividad neuronal en el latSC.
- El rastreo viral y la microestimulación óptica para mapear las vías neuronales y la organización funcional.
Principales resultados:
- Los ratones integraron el tacto y la posición de la lengua para volver a apuntar las lamidas cuando un chorro de agua se movió inesperadamente.
- Fotoinactivación del latSC, pero no de las áreas corticales, deterioro de la reorientación guiada por tacto.
- Las neuronas latSC exhibieron campos receptivos mecanosensoriales y codificaron la posición de la lengua.
- El latSC contiene un mapa topográfico para apuntar licks, recibiendo entradas del núcleo trigémino lingüal.
Conclusiones:
- El colículo superior lateral (latSC) juega un papel crítico en el control dinámico de la lengua guiado por el tacto.
- El latSC funciona como un mapa mecano-sensoriomotor, integrando información táctil y propioceptiva para movimientos precisos de la lengua.
- Estos hallazgos revelan un mecanismo colicular para comportamientos de orientación guiados por el tacto, análogo a las vías visuomotrices conocidas.
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