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Ionic Direct Current Enables Millimeter- and Millisecond-Scale Cortical Gain Control in vivo.

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  • 1Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA.

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Ionic direct current (iDC) precisely controls brain excitability in rats, enhancing or suppressing neural responses. This method offers a new tool for studying brain circuits and developing therapies.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience

Background:

  • Cortical network excitability is crucial for processing sensory input.
  • Existing methods for modulating excitability lack temporal and spatial precision.

Purpose of the Study:

  • To investigate the use of ionic direct current (iDC) for precise, real-time modulation of cortical excitability.
  • To explore the mechanisms underlying iDC-induced changes in neural responses.

Main Methods:

  • Applied iDC with high temporal (sub-10 ms) and spatial (submillimeter) resolution to the rat S1HL cortex.
  • Recorded laminar neural responses to spontaneous delta oscillations and evoked foot stimulation.
  • Utilized a computational model to simulate and interpret the effects of iDC.

Main Results:

  • Cathodic iDC suppressed and anodic iDC enhanced evoked neural responses.
  • iDC modulated the spatiotemporal excitability pattern in a graded manner.
  • Computational modeling suggested dendritic summation at the axon initial segment (AIS) as a key mechanism.

Conclusions:

  • iDC provides a powerful tool for precise, causal manipulation of cortical responsiveness in vivo.
  • This technique facilitates the dissection of functional neural circuits.
  • iDC offers a platform for developing targeted neurotherapeutic interventions.