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Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

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...
Neuronal Communication01:28

Neuronal Communication

Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
The Synapse02:47

The Synapse

Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
Synaptic Signaling01:09

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
Synaptic Signaling01:12

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.

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Related Experiment Video

Updated: Jul 3, 2026

Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
08:08

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Published on: June 24, 2015

High frequency electrical stimulation paces fast spiking interneurons and modulates cellular information processing.

Pierre Fabris1, Eric Lowet2, Krishnakanth Kondabolu1

  • 1Department of Biomedical Engineering, Boston University, Boston, MA, USA.

Communications Biology
|July 1, 2026
PubMed
Summary
This summary is machine-generated.

High-frequency brain stimulation paces visual cortex fast spiking interneurons (FSIs) but suppresses motor cortex FSIs. This neuromodulation impacts how FSIs process neural inputs, with region-specific effects.

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Silicon Nanowires and Optical Stimulation for Investigations of Intra- and Intercellular Electrical Coupling

Published on: January 28, 2021

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Neural Engineering

Background:

  • High-frequency intracranial electrical stimulation is a clinical tool with unclear therapeutic mechanisms.
  • Neuromodulation is theorized to disrupt pathological brain dynamics by creating functional informational lesions.
  • Fast spiking interneurons (FSIs) may be uniquely affected by high-frequency stimulation due to their rapid firing rates.

Purpose of the Study:

  • To investigate the real-time effects of intracranial electrical stimulation on fast spiking interneurons (FSIs).
  • To understand how FSIs in different brain regions (visual vs. motor cortex) respond to varying stimulation frequencies.
  • To determine the impact of high-frequency neuromodulation on the input processing capabilities of FSIs.

Main Methods:

  • Utilized cellular voltage imaging in awake mice to observe real-time FSI responses to electrical stimulation.
  • Applied both high-frequency (140 Hz) and low-frequency (40 Hz) stimulation.
  • Measured FSI responses to visual flicker stimuli during electrical stimulation.

Main Results:

  • Visual cortex FSIs were reliably paced by 140 Hz stimulation, while motor cortex FSIs were not.
  • Low-frequency 40 Hz stimulation suppressed both visual and motor cortex FSIs.
  • 140 Hz stimulation significantly reduced the amplitude of visually evoked FSI responses.

Conclusions:

  • High-frequency neuromodulation exhibits brain-region-dependent effects on FSI pacing.
  • Intracranial electrical stimulation modulates the cellular processing of inputs by FSIs.
  • The findings provide insights into the mechanisms of high-frequency neuromodulation and its differential impact on neural circuits.