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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Schizophrenia is a complex psychiatric disorder characterized by a range of symptoms that significantly impact cognition, behavior, and emotional regulation. Among these, the positive symptoms stand out as they involve the addition or exaggeration of normal mental functions, deviating markedly from typical behavior and perception. Hallucinations and delusions are prominent positive symptoms, each profoundly affecting the individual's experience of reality.
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Video Experimental Relacionado

Updated: Sep 9, 2025

Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention
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Procesamiento del centro-en torno en la psicosis

Samantha A Montoya1, Hannah R Moser2, Rohit S Kamath2

  • 1Graduate Program in Neuroscience, University of Minnesota, Minneapolis, MN.

medRxiv : the preprint server for health sciences
|September 2, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Las personas con psicopatología psicótica muestran un procesamiento visual alterado, específicamente una supresión circundante más débil en algunas áreas del cerebro pero no en otras. Esto sugiere diferencias sutiles en cómo el cerebro procesa el contexto visual, potencialmente impactando la confiabilidad neuronal en la esquizofrenia.

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Área de la Ciencia:

  • La neurociencia
  • Percepción visual
  • Psicopatología

Sus antecedentes:

  • Las personas con psicopatología psicótica (PwPP) exhiben una percepción visual alterada.
  • La supresión de contraste circundante es una ilusión visual en la que los patrones circundantes reducen el contraste percibido de un patrón central.
  • PwPP generalmente muestra una supresión de contraste más débil que los controles, pero los mecanismos subyacentes siguen sin estar claros.

Objetivo del estudio:

  • Investigar la supresión del entorno perceptivo y neuronal en los controles, parientes de PwPP y PwPP.
  • Explorar los mecanismos neuronales que contribuyen a la disminución de la supresión circundante utilizando la resonancia magnética funcional y la espectroscopia de resonancia magnética.
  • Evaluar la concentración de GABA en la corteza occipital y su relación con el procesamiento visual.

Principales métodos:

  • Se evaluó la supresión circundante en 38 controles, 44 familiares y 64 PwPP.
  • Los umbrales de discriminación de contraste cuantificados y las respuestas de fMRI de 7 teslas en LGN, V1 y LOC.
  • Se midió la concentración de GABA occipital mediante espectroscopia de RM de 7 T.

Principales resultados:

  • La LOC mostró una supresión de los alrededores más débil en PwPP y en los parentes en comparación con los controles.
  • No se encontraron diferencias significativas en la fuerza de supresión circundante de V1 entre los grupos.
  • No hay evidencia conductual de supresión circundante reducida en PwPP; las métricas de supresión no se correlacionaron con GABA o síntomas.
  • V1 fMRI reveló diferencias de grupo en la decodificación del contexto circundante, con una menor precisión en PwPP.

Conclusiones:

  • Existen diferencias sutiles en el procesamiento visual alrededor del centro en las personas con esquizofrenia.
  • Las discrepancias con estudios previos pueden deberse al diseño de la tarea o a diferencias de atención.
  • La decodificación más pobre del centro frente al entorno en V1 sugiere representaciones neuronales menos confiables del contexto espacial en PwPP.