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Altering alpha-frequency brain oscillations with rapid analog feedback-driven neurostimulation.

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Area of Science:

  • Neuroscience
  • Neurotechnology

Background:

  • Brain oscillations, such as alpha (8-15 Hz) and beta (15-30 Hz) rhythms, are crucial for coordinating neural ensembles and brain networks.
  • Altering these oscillations is challenging, limiting causal testing and therapeutic translation.

Purpose of the Study:

  • To develop and test a closed-loop analog circuit for enhancing brain oscillations via phase-locked transcranial electrical stimulation.
  • To investigate the efficacy of this closed-loop system in modulating specific brain rhythms.

Main Methods:

  • A closed-loop analog circuit was designed to provide real-time feedback of local field potential (LFP) oscillations.
  • Phase-locked transcranial electrical stimulation was used to enhance targeted alpha oscillations (8-15 Hz) in a rhesus macaque model.
  • Stimulation effects were assessed on alpha power, beta rhythms, and adjacent neural areas.

Main Results:

  • Ten seconds of closed-loop stimulation significantly increased alpha oscillatory power for up to 1 second post-stimulation.
  • In contrast, open-loop stimulation led to a decrease in alpha power.
  • No significant effects were observed on neighboring beta rhythms or on neural areas not involved in the feedback loop.

Conclusions:

  • Analog closed-loop neurostimulation is a viable strategy for effectively altering brain oscillations.
  • This technique holds potential for advancing basic neuroscience research and developing treatments for neuropsychiatric disorders.