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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...
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Vision01:24

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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.
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Visual System01:26

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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.
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Motor and Sensory Areas of the Cortex01:14

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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.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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Updated: Sep 10, 2025

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
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Repensar la selectividad de categoría en la corteza visual humana

J Brendan Ritchie1, Susan G Wardle1, Maryam Vaziri-Pashkam1,2

  • 1Section on Learning and Plasticity (SLaP), Laboratory of Brain and Cognition, National Institute of Mental Health, Bethesda, MD, USA.

Cognitive neuroscience
|August 21, 2025
PubMed
Resumen
Este resumen es generado por máquina.

El procesamiento visual en la corteza occipitotemporal puede entenderse mejor enfocándose en la relevancia del comportamiento en lugar de la categoría de estímulo. Este enfoque ofrece una visión más completa de la función visual en entornos del mundo real.

Palabras clave:
Selectividad por categoríasrelevancia en el comportamientoNeuroimágenesLa corteza occipitotemporalescenas del mundo reallas tareasla visión

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Área de la Ciencia:

  • La neurociencia
  • Ciencias cognitivas
  • Percepción visual

Sus antecedentes:

  • Se sabe que la corteza occipitotemporal contiene regiones selectivas para estímulos como caras y herramientas.
  • La comprensión actual a menudo se basa en el mapeo de categorías de estímulos a áreas específicas del cerebro.

Objetivo del estudio:

  • Proponer un cambio de enfoque de la selectividad de la categoría a la relevancia del comportamiento para comprender la función de la corteza occipitotemporal.
  • Explorar cómo las metas modulan la representación visual de la propiedad en contextos del mundo real.

Principales métodos:

  • Debate teórico y síntesis de las investigaciones existentes.
  • Proponer nuevos marcos para la investigación empírica.

Principales resultados:

  • La selectividad por categorías proporciona información valiosa, pero puede ser insuficiente para una comprensión completa.
  • La relevancia conductual ofrece una perspectiva más completa, reconociendo las representaciones de propiedades visuales moduladas y diversas.

Conclusiones:

  • Repensar la función visual en la corteza occipitotemporal a través de la relevancia del comportamiento es crucial.
  • Este cambio requiere abordar desafíos teóricos y empíricos para avanzar en nuestra comprensión del procesamiento visual.