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Videos de Conceptos Relacionados

Vision01:24

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.
Motor and Sensory Areas of the Cortex01:14

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.
Association Areas of the Cortex01:21

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,...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...

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Neurology·2010
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Distance perception within near visual space.

Perception·2001
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Neural processing of stereopsis as a function of viewing distance in primate visual cortical area V1.

Journal of neurophysiology·1996
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Video Experimental Relacionado

Updated: Jul 2, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
08:42

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

Published on: February 8, 2020

La dirección de la mirada controla la ganancia de respuesta en las neuronas de la corteza visual primaria.

Y Trotter1, S Celebrini

  • 1Centre de Recherche Cerveau et Cognition, Faculté de Médecine de Rangueil, Université Paul Sabatier, Toulouse, France. trotter@cerco.ups-tlse.fr

Nature
|March 27, 1999
PubMed
Resumen

El cerebro combina la información visual y la posición del ojo para localizar objetos. Las neuronas del área V1 modulan las respuestas visuales basadas en la dirección de la mirada, lo que indica un procesamiento espacial 3D temprano.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • La neurociencia computacional es una neurociencia computacional.
  • La percepción visual es la percepción visual.

Sus antecedentes:

  • La localización de objetos requiere integrar la posición del estímulo retiniano con la posición del ojo.
  • El papel de la corteza visual primaria (área V1) en esta integración no se entiende bien.

Objetivo del estudio:

  • Investigar el papel del área V1 en la integración de la información visual y la posición del ojo para la localización espacial.
  • Para determinar si la dirección de la mirada influye en las respuestas neuronales en el área V1 relacionada con la percepción de profundidad.

Principales métodos:

  • Actividad neuronal registrada en el área V1 de monos que se comportan.
  • Analizó las respuestas neuronales en relación con las propiedades del estímulo y la dirección de la mirada.
  • Se investigó la selectividad para la disparidad retiniana horizontal y la orientación al estímulo.

Principales resultados:

  • Aproximadamente la mitad de las células del área V1 registradas mostraron respuestas visuales moduladas por la dirección de la mirada.
  • La selectividad para la disparidad retiniana horizontal y la orientación del estímulo varió con la dirección de la mirada.
  • Algunas neuronas exhibieron cambios en la disparidad preferida dependiendo de la dirección de la mirada.
  • La modulación a menudo ocurría temprano en la respuesta visual, lo que sugiere un control de ganancia de avance de alimentación por señales de posición ocular.

Conclusiones:

  • El área V1 juega un papel crucial en la integración de las señales de posición del ojo con la información visual.
  • El procesamiento cortical para la información espacial 3D comienza tan pronto como el área V1.
  • La dirección de la mirada influye significativamente en la codificación neural de los estímulos visuales en la corteza visual primaria.