Resumen
Desde la década de 1970, la disponibilidad de neuroimágenes estructurales (tomografia computarizada y resonancia magnética) y funcionales como la tomografía computarizada por emisión de fotón único (SPECT), la tomografia por emisión de positrones (PET) o la resonancia magnética funcional (fMRI)), abrió una nueva via en el estudio de la relación bidireccional que existe entre los fenómenos comportamentales y la actividad neuronal. La introducción de estas técnicas condujo a una mejor comprensión del impacto de una lesión cerebral en la actividad cortical y en el desarrollo de síntomas psiquiátricos. Explicar la presencia de síntomas afectivos como una alteración en la función de una estructura cerebral es insuficiente, y se debe considerar siempre un compromiso de los circuitos cerebrales. Muchos trastornos del afecto se han asociado con lesiones en las conexiones talamolímbicas, incluyendo trastorno depresivo mayor, trastorno obsesivo-compulsivo, adicción a sustancias psicoactivas y trastorno de estrés postraumático, por lo que la identificación de los tractos de conectividad puede proporcionar nuevos medios para una intervención terapéutica eficaz.
Citas
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