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Desconexión de las áreas cerebrales relevantes para el habla en la tartamudez persistente del desarrollo
Martin Sommer1, Martin A Koch, Walter Paulus
1NeuroImage Nord, Department of Neurology, University of Hamburg, Hamburg, Germany.
Lancet (London, England)
|September 21, 2002
Resumen
La tartamudez persistente en el desarrollo puede deberse a tractos alterados de la sustancia blanca en el cerebro, lo que afecta la producción del habla. Esta investigación sugiere que la comunicación neuronal deteriorada subyace a la tartamudez, no solo a problemas de dominación del hemisferio.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Neurología Neurología.
- Ciencias del habla Ciencias del habla.
Sus antecedentes:
- La causa subyacente de la tartamudez persistente en el desarrollo sigue sin estar clara.
- Las hipótesis incluyen la reducción de la dominación del hemisferio izquierdo que conduce a la sobreactivación del hemisferio derecho, o un déficit primario dentro del hemisferio izquierdo.
- Estudios previos sugieren perturbaciones de la sincronización en las áreas lingüísticas del hemisferio izquierdo, lo que apunta a una comunicación neuronal deteriorada posiblemente debido a la interrupción de la sustancia blanca.
Objetivo del estudio:
- Investigar si la desconexión estructural entre las áreas corticales relacionadas con el habla es la base de la tartamudez persistente del desarrollo.
- Para identificar las diferencias estructurales específicas del cerebro en los individuos que tartamudean.
Principales métodos:
- Análisis del habla de 15 individuos con tartamudez persistente en el desarrollo y 15 controles emparejados para cuantificar la gravedad de la tartamudez.
- Se empleó imágenes de tensor de difusión (DTI) para examinar la microestructura del tejido cerebral.
- Se utilizaron pruebas t de dos muestras para comparar las características de difusión entre los grupos de tartamudeo y control.
Principales resultados:
- Se observaron diferencias significativas en las características de difusión entre el grupo de tartamudez y los controles.
- Estas diferencias se localizaron inmediatamente debajo de las áreas de representación de la laringe y la lengua en la corteza sensorimotora izquierda.
- Se encontró una diferencia media en la anisotropía fraccionaria de 0.04 (95% IC 0.03-0.05).
Conclusiones:
- El tartamudeo persistente en el desarrollo está asociado con un tiempo perturbado de activación en regiones cerebrales relevantes para el habla.
- Los hallazgos sugieren que la hiperactivación en el hemisferio derecho puede ser una respuesta compensatoria, similar a los patrones observados en la afasia.
- La desconexión estructural en las vías relacionadas con el habla está implicada como un factor clave en la tartamudez.
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