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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

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Updated: Jul 2, 2026

A Wireless, Bidirectional Interface for In Vivo Recording and Stimulation of Neural Activity in Freely Behaving Rats
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A wireless, 60-channel, AI-enabled neurostimulation platform.

Daniel S Rizzuto1, Haydn G Herrema1, Zhe Hu1

  • 1Nia Therapeutics, Inc., Allston, 02134, MA, USA.

Brain Stimulation
|December 22, 2025
PubMed
Summary
This summary is machine-generated.

The Smart Neurostimulation System (SNS) decodes brain states and enables closed-loop neuromodulation. This preclinical device shows promise for targeting brain networks involved in memory and cognition.

Keywords:
Artificial intelligenceBiomarkersBrain computer interfaceHuman memoryNeuromodulation

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Neuromodulation

Background:

  • Closed-loop neuromodulatory therapies necessitate advanced devices capable of real-time brain state decoding and multi-site stimulation.
  • Current technologies often lack the integration required for seamless operation in freely moving subjects.

Purpose of the Study:

  • To introduce and evaluate the Smart Neurostimulation System (SNS), a novel implantable device for closed-loop neuromodulation.
  • To demonstrate the device's capability for high-density neural recording, brain state decoding, and programmable stimulation in vivo.

Main Methods:

  • The Smart Neurostimulation System (SNS) is a cranially mounted implant featuring 60 configurable recording/stimulation channels, inductive power, and onboard spectral-feature classification.
  • Experiments were conducted in three freely-moving sheep, involving streaming of local-field potentials and parameter-sweep stimulation protocols.

Main Results:

  • Movement classifiers achieved high accuracy (average AUC > 0.95) through cross-validation.
  • Stimulation with varying amplitude and frequency resulted in observable increases in alpha and gamma band power in targeted cortical areas.

Conclusions:

  • The SNS successfully integrates high-density sensing, real-time brain state decoding, and closed-loop stimulation in a single, implantable device.
  • The study demonstrates the potential for biomarker-guided stimulation targeting distributed cortical networks crucial for memory and cognition.