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Related Concept Videos

Gap Junctions01:37

Gap Junctions

57.4K
Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Gap Junctions01:27

Gap Junctions

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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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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Electrical Synapses01:28

Electrical Synapses

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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
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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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Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
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Related Experiment Video

Updated: Feb 17, 2026

Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons
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Efficient encoding of motion is mediated by gap junctions in the fly visual system.

Siwei Wang1, Alexander Borst2, Noga Zaslavsky3

  • 1Department of Neurobiology, Hebrew University Jerusalem, Jerusalem, Israel.

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|December 6, 2017
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Electrical synapses, or gap junctions, in the fly visual system enable rapid and efficient encoding of motion. This network connectivity is crucial for downstream processing and visually guided behaviors.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Sensory Processing

Background:

  • The computational role of electrical synapses (gap junctions) in neural networks is not fully understood.
  • The fly's vertical system (VS) network, crucial for visual processing, utilizes axonal gap junctions for inter-neuronal communication.

Purpose of the Study:

  • To investigate the functional role of axonal gap junctions in the VS network for sensory information processing.
  • To determine how specific synaptic connectivity patterns influence computational efficiency in neural circuits.

Main Methods:

  • Information theoretical analysis of a realistic VS network model.
  • Simulation of visual input and analysis of motion encoding efficiency.
  • Investigation of subpopulation efficiency and robustness to noise.

Main Results:

  • Axonal gap junctions enable the VS system to efficiently encode the axis of rotation (θ) of fly ego motion within 10 ms.
  • Encoding efficiency is near-optimal, limited only by the input's statistical structure.
  • A specific subpopulation of VS cells shows superior encoding efficiency due to gap junctions, robust across signal-to-noise ratios.

Conclusions:

  • Specific network connectivity, particularly axonal gap junctions, significantly enhances sensory encoding efficiency.
  • This efficient motion encoding by a VS subpopulation is vital for visually guided behaviors like evasive maneuvers.
  • Neural computation may be more complex than previously thought, with connectivity impacting readout while preserving input integrity.