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Related Concept Videos

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...
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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...
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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

8.5K
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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Related Experiment Video

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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The emergence of functional microcircuits in visual cortex.

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
Summary

Newly formed cortical circuits connect neurons with similar visual responses after eye opening. This suggests a sequential development of sensory processing, prioritizing feature selectivity before precise local synaptic organization.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Systems Neuroscience

Background:

  • Neocortical microcircuits feature structured synaptic connectivity for sensory processing.
  • The developmental basis of functionally organized cortical microcircuits is not fully understood.

Purpose of the Study:

  • To investigate the developmental mechanisms of functional connectivity in mouse visual cortex.
  • To correlate synaptic connectivity patterns with visual response properties of neurons during development.

Main Methods:

  • In vivo two-photon calcium imaging.
  • In vitro multiple whole-cell recordings from layer 2/3 pyramidal neurons.
  • Analysis of excitatory synaptic connectivity and visual response selectivity at different postnatal ages.

Main Results:

  • Neuronal responses were selective at eye opening, but preferential connectivity between neurons with similar responses emerged later.
  • Local connectivity reorganized post-eye opening, with increased selective connections between visually responsive neurons and elimination of connections between unresponsive neurons.
  • Overall connectivity rates remained stable throughout development.

Conclusions:

  • Emergence of visual feature selectivity does not depend on precise local synaptic arrangement at eye opening.
  • Cortical microcircuit development follows a sequential model: neurons gain feature preference via feedforward inputs, potentially aided by electrical coupling, before sensory experience.
  • Patterned sensory input then drives the formation of functional subnetworks through activity-dependent plasticity and redistribution of recurrent synaptic connections.