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Related Concept Videos

Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

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The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
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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.
Membrane potential in neurons
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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.
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An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
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Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
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Positive and biphasic extracellular waveforms correspond to return currents and axonal spikes.

Shirly Someck1,2, Amir Levi1,2, Hadas E Sloin1,2

  • 1Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 6997801, Israel.

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Researchers discovered that non-negative extracellular spikes in the brain represent distinct neural activities, such as axonal potentials and return currents. This finding helps understand brain function and dysfunction.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Biophysics

Background:

  • Extracellular recordings can detect neural activity, but the origin of non-negative waveforms during action potentials remains unclear.
  • Understanding these signals is crucial for interpreting neural circuit function in vivo.

Purpose of the Study:

  • Investigate the origin and prevalence of non-negative extracellular spikes in the intact brain.
  • Correlate these waveforms with specific neuronal compartments and activities.

Main Methods:

  • Extracellular recordings from densely-connected cortical networks in freely-moving mice.
  • Analysis of spike waveform shapes and their temporal relationship with neuronal firing.

Main Results:

  • Approximately 10% of extracellular waveforms were non-negative.
  • Non-negative spikes were associated with return currents near the soma and axonal potentials.
  • Isolated biphasic spikes were linked to inhibitory neuronal activity.

Conclusions:

  • Non-negative extracellular potentials can indicate specific neural events like axonal activity and return currents.
  • Identifying these waveforms enhances understanding of neural mechanisms in physiological and pathological states.
  • This research provides a new framework for interpreting extracellular recordings in the brain.