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Conservación de los procesos de alimentación hacia adelante, pero deterioro de los procesos descendentes en el estado
Melanie Boly1, Marta Isabel Garrido, Olivia Gosseries
1Coma Science Group, Cyclotron Research Centre and Neurology Department, University of Liège and CHU Sart Tilman Hospital, 4000 Liège, Belgium. mboly@ulg.ac.be
Science (New York, N.Y.)
|May 14, 2011
Resumen
El deterioro del procesamiento de arriba hacia abajo en el cerebro, específicamente la conectividad hacia atrás de la corteza frontal a la temporal, es un indicador clave de la conciencia en pacientes con daño cerebral severo. Este hallazgo destaca el papel del procesamiento recurrente en la percepción consciente.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Neurociencia cognitiva y neurociencia cognitiva.
- Neurología Clínica Neurología Clínica
Sus antecedentes:
- La corteza frontoparietal juega un papel en el procesamiento de estímulos explícitos y subliminales.
- La conciencia en pacientes con daño cerebral severo es difícil de evaluar de manera confiable.
- Los procesos de arriba hacia abajo y las respuestas electrofisiológicas de larga latencia son correlatos potenciales de la conciencia.
Objetivo del estudio:
- Para investigar el papel del procesamiento de arriba hacia abajo en la conciencia.
- Para identificar correlatos neuronales confiables de la conciencia en pacientes en estado vegetativo.
- Para comparar las respuestas frontoparietales con medidas de procesamiento recurrente.
Principales métodos:
- Conectividad efectiva medida utilizando un paradigma de negatividad de desajuste.
- Comparación de la actividad cerebral entre pacientes en estado vegetativo y controles sanos.
- Centrado en la conectividad hacia atrás de la corteza frontal a la corteza temporal.
Principales resultados:
- La diferencia primaria observada fue el deterioro de la conectividad hacia atrás en pacientes en estado vegetativo en comparación con los controles.
- Las respuestas fronto-parietales no mostraron diferencias significativas.
- Este deterioro en las proyecciones de arriba hacia abajo fue específico para el procesamiento recurrente.
Conclusiones:
- El deterioro de la conectividad hacia atrás de la corteza frontal a la temporal es un correlato confiable de la conciencia en pacientes con daño cerebral severo.
- Las proyecciones de arriba hacia abajo son cruciales para el procesamiento recurrente y la percepción consciente.
- Este hallazgo enfatiza la importancia de evaluar el paso recurrente de mensajes neuronales para la evaluación de la conciencia.
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