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Localized Theta-Burst Magnetic Stimulation Induces Bidirectional Neural Modulation in the Mouse Auditory Cortex In

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Summary
This summary is machine-generated.

Theta-burst magnetic stimulation (TBS) bidirectionally modulates the mouse auditory cortex. Intermittent TBS increased neural activity, while continuous TBS decreased it, primarily in superficial cortical layers.

Keywords:
auditory cortexelectrophysiologymodulationrodenttheta-burst magnetic stimulationtranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Noninvasive Brain Stimulation

Background:

  • Repetitive transcranial magnetic stimulation (rTMS) is a noninvasive brain stimulation technique used for various neurological disorders.
  • Theta-burst magnetic stimulation (TBS) offers long-lasting modulatory effects with brief stimulation periods.
  • The precise effects of TBS on auditory brain regions and their neural mechanisms remain largely unexplored in animal models.

Purpose of the Study:

  • To investigate the physiological effects of intermittent TBS (iTBS) and continuous TBS (cTBS) on the rodent auditory cortex.
  • To explore the depth-dependent modulation within the auditory cortex.
  • To provide a foundation for optimizing TBS protocols for auditory function.

Main Methods:

  • Utilized a custom-built 7 mm magnetic stimulation coil for TBS application in C57BL/6J mice.
  • Performed extracellular recordings of local field potentials and multiunit activities before, during, and after stimulation.
  • Administered intermittent TBS (iTBS), continuous TBS (cTBS), and sham stimulation protocols.

Main Results:

  • Local field potential amplitudes increased post-iTBS and decreased post-cTBS compared to sham, indicating bidirectional modulation.
  • Multiunit activities were significantly altered in superficial cortical layers (2/3 and 4) but not layer 5.
  • A delayed increase in average spike waveform amplitude was observed in the iTBS group.

Conclusions:

  • TBS induces bidirectional modulatory effects in the mouse auditory cortex, consistent with findings in other brain regions.
  • The observed modulation is localized to the superficial layers of the auditory cortex.
  • These findings offer crucial physiological evidence for TBS effects on the auditory system and inform future rTMS applications for hearing modulation.