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Decodificación espaciotemporal de los déficits de memoria de trabajo visual en la esquizofrenia mediante análisis de

Zhongsi Wang1, Yang Jiaqin1, Yuyan Jing1

  • 1School of Psychology, Qufu Normal University, Qufu, 273165, China.

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Resumen

Los pacientes con esquizofrenia presentan déficits en la memoria de trabajo visual (vWM), caracterizados por una señalización neuronal y una discriminabilidad reducidas durante las tareas de memoria en comparación con los individuos sanos. Estos hallazgos resaltan una actividad cerebral alterada en las regiones posteriores cruciales para el mantenimiento de la vWM.

Palabras clave:
déficit cognitivodecodificaciónpotencial evocadoesquizofreniamemoria de trabajo visual

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Área de la Ciencia:

  • Neurociencia Cognitiva
  • Neuroimagen
  • Psiquiatría

Sus antecedentes:

  • Los déficits de memoria de trabajo visual (vWM) son una característica central de la esquizofrenia.
  • Los mecanismos neuronales precisos y la dinámica espaciotemporal subyacentes a estas alteraciones de la vWM no se comprenden completamente.

Objetivo del estudio:

  • Investigar las diferencias en la señalización neuronal en la vWM entre pacientes con esquizofrenia (PSZ) y controles sanos (HCS).
  • Caracterizar la dinámica espaciotemporal de los déficits de vWM utilizando técnicas avanzadas de neuroimagen.

Principales métodos:

  • Se empleó la clasificación de patrones multivariantes (MVPC) y el análisis de búsqueda de puntos en datos de electroencefalografía (EEG).
  • Se analizó la actividad contralateral de retardo (CDA) durante una tarea de detección de cambios con cargas de memoria variables (1T/2T/4T).
  • Se decodificó la carga de memoria y la información lateral tanto en dimensiones temporales como espaciales.

Principales resultados:

  • Los pacientes con esquizofrenia mostraron una amplitud de CDA significativamente menor en comparación con los controles sanos.
  • El MVPC reveló una precisión de decodificación significativamente menor en PSZ durante el período de retardo (176-656 ms), lo que indica una menor discriminabilidad de patrones.
  • El análisis de búsqueda de puntos mostró una decodificación reducida generalizada en PSZ, particularmente sobre las regiones parieto-occipitales posteriores.

Conclusiones:

  • La esquizofrenia se asocia con déficits espaciotemporales en los mecanismos neuronales que sustentan el mantenimiento de la vWM.
  • La discriminabilidad neuronal reducida y la actividad cerebral posterior son características clave de las alteraciones de la vWM en la esquizofrenia.
  • Los hallazgos pueden guiar el desarrollo de intervenciones cognitivas guiadas por biomarcadores para la esquizofrenia.