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Videos de Conceptos Relacionados

Vision01:24

Vision

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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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Neural Circuits01:25

Neural Circuits

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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
3.0K
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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.
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....
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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...
8.6K
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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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Visual System01:26

Visual System

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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.
Once through the pupil, the light passes through the lens, a...
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Video Experimental Relacionado

Updated: May 6, 2026

Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
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Published on: December 12, 2012

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La aparición de microcircuitos funcionales en la corteza visual.

Ho Ko1, Lee Cossell, Chiara Baragli

  • 1Department of Neuroscience, Physiology and Pharmacology, University College London, 21 University Street, London WC1E 6DE, UK.

Nature
|April 5, 2013
PubMed
Resumen

Los circuitos corticales recién formados conectan las neuronas con respuestas visuales similares después de la apertura del ojo. Esto sugiere un desarrollo secuencial del procesamiento sensorial, priorizando la selectividad de las características antes que una organización sináptica local precisa.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Neurociencia del desarrollo neurológico.
  • La neurociencia de sistemas es la neurociencia de sistemas.

Sus antecedentes:

  • Los microcircuitos neocorticales cuentan con conectividad sináptica estructurada para el procesamiento sensorial.
  • La base del desarrollo de los microcircuitos corticales funcionalmente organizados no se entiende completamente.

Objetivo del estudio:

  • Investigar los mecanismos de desarrollo de la conectividad funcional en la corteza visual del ratón.
  • Para correlacionar los patrones de conectividad sináptica con las propiedades de respuesta visual de las neuronas durante el desarrollo.

Principales métodos:

  • In vivo imágenes de calcio de dos fotones.
  • In vitro múltiples grabaciones de células enteras de la capa 2/3 de las neuronas piramidales.
  • Análisis de la conectividad sináptica excitatoria y la selectividad de la respuesta visual en diferentes edades postnatales.

Principales resultados:

  • Las respuestas neuronales fueron selectivas al abrir los ojos, pero la conectividad preferencial entre neuronas con respuestas similares surgió más tarde.
  • La conectividad local se reorganizó después de la apertura del ojo, con un aumento de las conexiones selectivas entre las neuronas que responden visualmente y la eliminación de las conexiones entre las neuronas que no responden.
  • Las tasas generales de conectividad se mantuvieron estables durante todo el desarrollo.

Conclusiones:

  • La aparición de la selectividad de las características visuales no depende de la disposición sináptica local precisa en la apertura del ojo.
  • El desarrollo de los microcircuitos corticales sigue un modelo secuencial: las neuronas obtienen preferencia de características a través de entradas de alimentación avanzada, potencialmente ayudadas por acoplamiento eléctrico, antes de la experiencia sensorial.
  • La entrada sensorial modelada impulsa la formación de subredes funcionales a través de la plasticidad dependiente de la actividad y la redistribución de las conexiones sinápticas recurrentes.