El papel de la amígdala en una tarea de discriminación de expresiones emocionales

Psicothema, ISSN 0214-9915, Vol. 19, Nº. 1, 2007, pags. 23-29 01/2007;
Source: OAI


El papel de la amígdala en una tarea de discriminación de expresiones emocionales. Se evaluaron 50 pacientes con epilepsia del lóbulo temporal con resección unilateral del hipocampo y la amígdala 27 con lobectomía izquierda (grupo LTL) y 23 con lobectomía derecha (grupo RTL) y a 28 participantes controles (grupo HC). La tarea consistió en identificar cuál era la fotografía de la cara diferente entre un conjunto de fotografías de caras iguales. La diferencia podía corresponder a la identidad o a la expresión facial (alegría, ira, tristeza y miedo). Los resultados indicaron que cuando la fotografía difería en la identidad, el grupo RTL cometió más errores que el grupo HC. Cuando la fotografía difería en la expresión, la latencia media de respuesta fue superior en el grupo LTL que en el grupo HC. Al comparar entre emociones, las diferencias principales fueron para la expresión de miedo en los tres grupos de participantes. Se discute la disociación de los circuitos neurales responsables del procesamiento de la cara y, particularmente, el papel de la amígdala izquierda en la discriminación de expresiones faciales.

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