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Related Concept Videos

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.
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...
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,...
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.
The Retina01:32

The Retina

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.
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...

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Related Experiment Video

Updated: May 25, 2026

In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution
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In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution

Published on: November 21, 2023

Peripheral and central inputs shape network dynamics in the developing visual cortex in vivo.

Friederike Siegel1, J Alexander Heimel, Judith Peters

  • 1Department of Synapse and Network Development, Netherlands Institute for Neuroscience, 1105 BA Amsterdam, The Netherlands.

Current Biology : CB
|January 24, 2012
PubMed
Summary
This summary is machine-generated.

Spontaneous retinal activity and intrinsic network dynamics shape the developing visual cortex. Researchers identified two distinct network activity patterns, one retinal-driven and one intrinsic, crucial for forming visual circuits.

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Inducing Long-Term Plasticity of Intrinsic Neuronal Excitability in Neurons of the Dorsal Lateral Geniculate Nucleus
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Related Experiment Videos

Last Updated: May 25, 2026

In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution
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In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution

Published on: November 21, 2023

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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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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Inducing Long-Term Plasticity of Intrinsic Neuronal Excitability in Neurons of the Dorsal Lateral Geniculate Nucleus
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Published on: September 20, 2024

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Systems Neuroscience

Background:

  • Spontaneous network activity is crucial for neuronal circuit development.
  • Retinal waves before vision onset shape the developing visual pathway.
  • The cellular-level impact of retinal input on visual cortex network dynamics remains unclear.

Purpose of the Study:

  • To investigate how retinal inputs influence network dynamics in the primary visual cortex (V1) at the cellular level.
  • To identify and characterize distinct patterns of spontaneous network activity in the developing V1.
  • To understand the origins and functional roles of these activity patterns during visual system formation.

Main Methods:

  • In vivo two-photon calcium imaging in mice.
  • Acute manipulation of spontaneous retinal activity.
  • Analysis of network activity patterns, synchronicity, wave progression, and developmental profiles.

Main Results:

  • Two independent network activity patterns were identified in the mouse V1 before and at the onset of vision.
  • Low synchronicity (L-) events were largely retinal-driven.
  • High synchronicity (H-) events required gap junction signaling and were independent of retinal input.

Conclusions:

  • Developing V1 exhibits distinct, independently regulated network activity patterns.
  • Retinal input shapes specific network dynamics (L-events), while intrinsic mechanisms drive others (H-events).
  • These complementary activity patterns play vital roles in the formation of synaptic circuits in the developing visual cortex.