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Forma de onda del pulso y dirección de la corriente alteran la conectividad funcional inducida por TMS a nivel de
Delia Lucarelli1, Giacomo Guidali2, Roberto Guidotti1
1Department of Neuroscience, Imaging and Clinical Sciences, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy; Institute for Advanced Biomedical Technologies, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy.
NeuroImage
|February 9, 2026
Resumen
Los parámetros de estimulación magnética transcraneal (TMS) alteran significativamente la conectividad funcional electroencefalográfica (EEG) en el sistema motor. Comprender estos efectos es crucial para optimizar las aplicaciones de TMS e interpretar la dinámica de la red.
Área de la Ciencia:
- Neurociencia
- Ingeniería Biomédica
- Procesamiento de Señales
Sus antecedentes:
- El análisis de la conectividad funcional de los datos electroencefalográficos (EEG) durante la estimulación magnética transcraneal (TMS) concurrente proporciona información sobre la dinámica de la red cerebral.
- La influencia específica de los parámetros de TMS en estas mediciones de conectividad no se comprende bien, lo que limita las aplicaciones precisas.
Objetivo del estudio:
- Investigar el impacto de la forma de onda del pulso y la dirección de la corriente de TMS en la conectividad funcional EEG dentro del sistema motor.
- Analizar estos efectos en las bandas de frecuencia alfa y beta.
Principales métodos:
- Análisis de datos de EEG de 32 participantes sanos utilizando un repositorio de acceso abierto.
- Estimulación de la corteza motora primaria izquierda (M1) con diversas formas de onda de pulso monofásico y bifásico y direcciones de corriente de posterior a anterior (PA) y de anterior a posterior (AP).
- Examen de los patrones de conectividad funcional inducidos por TMS en diferentes condiciones de estimulación.
Principales resultados:
- La conectividad en la banda alfa mostró una comunicación generalizada y lateralizada a la derecha hacia las regiones sensoriomotoras, independiente de los parámetros de TMS.
- La conectividad en la banda beta fue más localizada y dependiente de la condición.
- Los pulsos monofásicos aumentaron la conectividad en la banda alfa en comparación con los pulsos bifásicos, y las corrientes AP causaron la mayor modulación.
- Patrones específicos de estimulación bifásica (AP-PA vs. PA-AP) modularon diferencialmente la conectividad en las bandas alfa y beta.
Conclusiones:
- Los parámetros de TMS modulan significativamente la dinámica oscilatoria y la conectividad funcional del sistema motor.
- La elección de las características de TMS puede activar selectivamente distintas redes funcionales, lo que contribuye a la variabilidad en las aplicaciones de TMS.
- Los hallazgos subrayan la importancia de seleccionar parámetros de TMS apropiados y confirman patrones específicos de frecuencia en la comunicación del sistema motor.
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