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La dinámica corticohippocampal canónica subyace a la memoria de los episodios de navegación y su declive temprano en
Jaeseob Lim1, Sang-Eon Park1, Sang-Hun Lee1
1Department of Brain and Cognitive Sciences, Seoul National University, Gwanak-gu, Seoul, Republic of Korea.
Imaging neuroscience (Cambridge, Mass.)
|August 21, 2025
Resumen
Dinámica neural canónica en el cerebro
Área de la Ciencia:
- La neurociencia
- Ciencias cognitivas
- Imágenes neurológicas
Sus antecedentes:
- La navegación exitosa se basa en el procesamiento dinámico de información perceptiva vinculada a puntos de referencia y curvas.
- Las diferencias individuales en la memoria de navegación y el deterioro relacionado con la edad pueden derivarse de desviaciones en la dinámica de la red corticohippocampal.
Objetivo del estudio:
- Investigar cómo las dinámicas neurales canónicas representan experiencias de navegación entre individuos.
- Explorar el vínculo entre la similitud individual-canónica (ICS) en la actividad cerebral y el rendimiento de la memoria de navegación.
- Determinar el papel del envejecimiento en estas dinámicas neuronales y su impacto en la función cognitiva.
Principales métodos:
- Escaneos de resonancia magnética funcional de 76 participantes (grupo de jóvenes y ancianos) viendo vídeos de navegación virtual.
- Cálculo de la dinámica canónica mediante el promedio de la actividad neuronal entre los participantes.
- Medición de la similitud individual con la canónica (ICS) y la conectividad funcional entre sujetos (ISFC).
Principales resultados:
- El ICS más alto observado en las corrientes visuales y precuneus, correlacionado con los eventos informativos de navegación.
- ICS del lóbulo temporal medial (MTL) y la coordinación hipocampo-corteza vinculada al rendimiento de la memoria espacial.
- La reducción de la ISFC entre la MTL y la dinámica cortical medió el efecto del envejecimiento en el rendimiento cognitivo.
Conclusiones:
- La dinámica neural canónica ofrece información sobre el procesamiento de eventos espaciotemporalmente extendido.
- La conectividad del lóbulo temporal medial (MTL) y la dinámica canónica son cruciales para la navegación y la memoria episódica, especialmente en el envejecimiento.
- Las desviaciones de la dinámica canónica en la red corticohippocampal impactan la memoria de navegación y se ven afectadas por el envejecimiento.
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