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Related Concept Videos

Action Potential01:14

Action Potential

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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
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Action Potential01:31

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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Propagation of Action Potentials01:23

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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
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The Role of Ion Channels in Neuronal Computation01:19

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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Neurons: The Axon01:21

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Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
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Neural Coding: Axonal Delays Make Waves.

Todd Troyer1

  • 1Department of Biology, University of Texas at San Antonio, San Antonio, TX 78249, USA.

Current Biology : CB
|February 9, 2021
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Summary
This summary is machine-generated.

Signal delays in local axons are crucial for precise song sequencing in songbirds. This finding, important for understanding neural circuits, may also apply to mammals.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Animal Behavior

Background:

  • Motor control relies on precise neural timing.
  • Songbirds exhibit millisecond-level precision in premotor activity during vocalization.

Purpose of the Study:

  • To investigate the role of axonal signal propagation delays in the precise sequencing of song production in songbirds.
  • To explore the cross-species relevance of these findings in mammalian neural circuits.

Main Methods:

  • Analysis of premotor activity in songbirds.
  • Modeling of signal propagation along local axons.
  • Cross-species comparative analysis with mammalian neural systems.

Main Results:

  • Premotor activity in songbirds is tightly synchronized with song production.
  • Delayed signal propagation along local axons is identified as a critical factor for smooth song sequencing.
  • Evidence suggests similar axonal delay mechanisms may be present in mammals.

Conclusions:

  • Axonal signal delays are essential for the temporal precision of learned vocalizations.
  • The findings highlight a conserved mechanism for motor sequence control across different species.
  • This research provides insights into the neural basis of complex motor behaviors.