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Association Areas of the Cortex

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.

Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Parallel Processing

Parallel Processing

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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Acoplamiento de alta frecuencia y largo alcance entre la corteza prefrontal y la corteza visual durante la atención.

Georgia G Gregoriou¹, Stephen J Gotts, Huihui Zhou

¹McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)

|May 30, 2009

Resumen

La atención mejora la comunicación cerebral al fortalecer las ondas cerebrales sincronizadas entre las áreas visual y frontal. Esta actividad sincronizada, particularmente en las frecuencias gamma, es iniciada por el campo ocular frontal (FEF) y mejora el flujo de información durante la atención enfocada.

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Área de la Ciencia:

La neurociencia es la neurociencia.
Neurociencia cognitiva y neurociencia cognitiva.
Procesamiento visual Procesamiento visual

Sus antecedentes:

Se observa una mejora de la atención de las respuestas neuronales y la sincronía gamma en las áreas visuales de la corriente ventral.
El origen de esta sincronía, ya sea intrínseca o impulsada por entradas, sigue sin estar claro.

Objetivo del estudio:

Investigar el papel de la comunicación entre áreas en la sincronía gamma relacionada con la atención.
Para determinar si el campo ocular frontal (FEF) influye en la sincronicidad en el área visual V4 durante la atención.

Principales métodos:

Se realizaron registros electrofisiológicos emparejados en el FEF y el área V4 de los monos.
El análisis se centró en el acoplamiento oscilatorio y la sincronía entre estas dos áreas durante las tareas atendidas.

Principales resultados:

La atención a un estímulo dentro del campo receptivo conjunto de FEF y V4 aumentó el acoplamiento oscilatorio entre las áreas, especialmente en frecuencias gamma.
Este acoplamiento mejorado fue iniciado por el FEF y mostró un retraso de tiempo de 8-13 milisegundos.
Los hallazgos sugieren una influencia direccional de FEF a V4.

Conclusiones:

La sincronía gamma impulsada por la atención entre FEF y V4 está mediada por un acoplamiento oscilatorio mejorado.
La entrada de FEF a V4, desplazada en el tiempo a frecuencias gamma, probablemente optimiza la comunicación entre áreas para mejorar el procesamiento visual durante la atención.