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El espacio visual se comprime en la corteza prefrontal antes de los movimientos oculares
Marc Zirnsak1, Nicholas A Steinmetz2, Behrad Noudoost2
11] Department of Neurobiology, Stanford University School of Medicine, Stanford, California 94305, USA [2] Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA.
Nature
|March 28, 2014
Resumen
Durante los movimientos oculares, los campos receptivos visuales (RF) en la corteza prefrontal convergen en el objetivo, en lugar de predecir el desplazamiento de la retina. Esta convergencia influye en la percepción visual y guía el control de la mirada.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Ciencias Cognitivas Ciencias Cognitivas.
- La percepción visual es la percepción visual.
Sus antecedentes:
- Los movimientos saccádicos de los ojos cambian la mirada, causando el desplazamiento de la imagen retiniana.
- La remodelación predictiva de los campos receptivos visuales (RF) es una hipótesis para mantener la estabilidad visual.
- La evidencia previa para el remapeo de RF se centró principalmente en ubicaciones postsacádicas.
Objetivo del estudio:
- Para investigar el comportamiento de las radiofrecuencias neuronales prefrontales durante la preparación de la sacada.
- Para determinar si las radiofrecuencias predicen desplazamientos de la retina mediante el re-mapeo de manera presacadica.
- Comprender los mecanismos neuronales que subyacen a la estabilidad visual durante los movimientos oculares.
Principales métodos:
- Grabaciones de múltiples electrodos en monos durante la fijación y la preparación de la sacada.
- Mapeo de RF visuales de las neuronas prefrontales antes y después de los movimientos oculares.
- Analizando los desplazamientos de RF en el espacio retinocéntrico y la convergencia hacia objetivos saccádicos.
Principales resultados:
- Las RF prefrontales convergieron hacia el objetivo saccádico antes del inicio del movimiento, desplazándose hasta 18 grados.
- La convergencia de RF aumentó tres veces la proporción de RF que respondieron a los estímulos de la región objetivo.
- Los estímulos presacádicos fueron mal localizados hacia el objetivo saccádico, reflejando la percepción humana.
Conclusiones:
- Las radiofrecuencias visuales en la corteza prefrontal no predicen el desplazamiento de la retina a través del remapeo antes de las saccades.
- La convergencia de RF refleja una percepción predominante del espacio objetivo durante la preparación del movimiento ocular.
- Este mecanismo contribuye a la estabilidad visual y al control de la mirada durante las saccades.
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