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In JoVE (1)

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Articles by Bryan J. Hansen in JoVE

 JoVE Neuroscience

El examen de procesamiento de la red local usando multi-contacto laminar de grabación de electrodos

1Graduate School of Biomedical Science, Neuroscience Program, University of Texas, 2Department of Neurobiology and Anatomy, University of Texas


JoVE 2806

Una cuestión fundamental en nuestra comprensión de los circuitos corticales es cómo las redes en diferentes capas corticales codificar la información sensorial. Aquí se describe la utilización de técnicas electrofisiológicas de múltiples electrodos de contacto laminar para grabar unidades únicas y potenciales locales de campo y análisis de la actualidad para identificar a las capas corticales.

Other articles by Bryan J. Hansen on PubMed

Attention Alters Visual Plasticity During Exposure-based Learning

It is generally believed that attention enhances the processing of sensory information during perception and learning. Here we report that, contrary to common belief, attention limits the degree of plasticity induced by repeated exposure to image features. Specifically, daily exposure to oriented stimuli that are not linked to a specific task causes an orientation-specific improvement in perceptual performance along the "exposed" axes. This effect is modulated by attention: human subjects showed a larger improvement in orientation discrimination when attention is directed toward the location where stimuli are presented. However, the capacity to perform discriminations away from the exposed orientation is enhanced when the exposure stimuli are unattended. Importantly, the improvement in orientation discrimination at the unattended location leads to a robust enhancement in the discrimination of complex stimuli, such as natural texture images, with orientation components along the exposed axes, whereas the improvement in orientation discrimination at the attended location exhibits only weak transfer to complex stimuli. These results indicate that sensory adaptation by passive stimulus exposure should be viewed as a form of perceptual learning that is complementary to practice-based learning in that it reduces constraints on generalization.

Adaptación Inducida De Sincronización En El Circuito De Laminar Cortical

Una característica fundamental del procesamiento de la información en la corteza cerebral es la capacidad de las neuronas individuales para adaptarse a los cambios en los estímulos entrantes. Cada vez se entiende que la adaptación cortical es un fenómeno que requiere la interacción de la red. El hecho de que la estructura de las redes locales depende críticamente de la capa cortical aumenta la posibilidad de que la adaptación podría inducir efectos específicos en diferentes capas. Aquí nos muestran que la exposición breve (300 ms) a un estímulo de orientación fija modula la fuerza de la sincronización entre neuronas individuales y de la actividad de la población local en la frecuencia de banda gamma (30-80 Hz) en macacos corteza visual primaria (V1) y las influencias la capacidad de las neuronas individuales para codificar la orientación estímulo. Utilizando sondas laminares, se encontró que aunque la presentación del estímulo provoca un gran aumento en la sincronización gamma de la actividad neuronal rítmica en la entrada (granular), capas de V1, la adaptación causó un aumento pronunciado en la sincronización en la salida cortical (supragranulares) capas. El incremento en la sincronización gamma después de la adaptación se correlacionó significativamente con una mejora en el rendimiento de la discriminación por orientación neuronal sólo en las capas supragranular. Por lo tanto, la sincronización entre la actividad de las neuronas individuales de adición y de su población local puede mejorar la codificación sensorial para optimizar el procesamiento de red a través de circuitos laminares.

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