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2014, Número 1

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Salud Mental 2014; 37 (1)


El origen y las funciones de los sueños a partir de los potenciales PGO

Ramírez-Salado I, Cruz-Aguilar MA

Idioma: Español
Referencias bibliográficas: 87
Paginas: 49-58
Archivo PDF: 363.09 Kb.


RESUMEN

El fenómeno del sueño y de los sueños es algo que siempre ha fascinado al hombre. Sin embargo, el estudio científico del sueño es relativamente reciente. En 1953, Aserinsky y Kleitman encontraron que el sueño de ondas lentas (SOL) es interrumpido periódicamente por episodios de actividad EEG rápida, que se acompañan de movimientos oculares rápidos (MORs), y denominaron a esta fase “sueño MOR”. Posteriormente, Dement y Kleitman, en 1957, descubrieron que estos movimientos oculares rápidos coinciden con la aparición de los sueños. Utilizando animales de experimentación se han estudiado los mecanismos subcorticales que subyacen al sueño MOR y se ha demostrado que éste depende de una actividad serotoninérgica de la vigilia, que promueve la formación de péptidos que ponen en marcha ciertas estructuras de la región pontina del tallo cerebral en donde se integran los mecanismos colinérgicos del sueño MOR. En la región pontina, a su vez, se generan potenciales monofásicos de alto voltaje (300-400 μV) que también pueden registrarse en el cuerpo geniculado lateral y en la corteza occipital, de allí el nombre de potenciales ponto-genículo-occipitales (PGO). Estos potenciales se propagan hacia el sistema oculomotor para provocar los MORs y posiblemente den origen a los fenómenos oníricos visuales. Además se ha demostrado que ciertas estructuras del sistema límbico, relacionadas con las emociones y la memoria, son activadas por dichos potenciales. Lo anterior sugiere que los potenciales PGO generan los componentes mnésicos y emocionales de los sueños. Quedan aún por determinarse varios aspectos sobre las funciones de estos potenciales, pero el conocimiento sobre el origen de los fenómenos cerebrales que generan los sueños ha tenido un gran avance a partir de su estudio. En el presente artículo se revisa la bibliografía concerniente a los trabajos realizados sobre los potenciales PGO y su aportación al conocimiento del origen y las funciones de los sueños.


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