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Related Experiment Video

Updated: May 10, 2026

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Variability-dominated auditory cortical dysfunction and targeted VNS modulation in a Mecp2+/- model of Rett syndrome.

Ghazaal Tahmasebi1, Katherine S Adcock2, Crystal T Engineer2

  • 1Department of Bioengineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA.

Experimental Neurology
|May 8, 2026
PubMed
Summary

Vagus nerve stimulation (VNS) partially improved auditory processing deficits in a preclinical model of Rett syndrome. Mecp2+/- rats showed abnormal responses, but VNS selectively restored some speech and noise-evoked cortical activity.

Keywords:
Auditory cortexFrequency bands oscillationsLocal field potentials (LFP)Rett syndromeVagus nerve stimulation (VNS)

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Area of Science:

  • Neuroscience
  • Genetics
  • Auditory Processing

Background:

  • Rett syndrome, a neurodevelopmental disorder, stems from MECP2 mutations, causing cortical network and sensory processing issues.
  • Mecp2+/- rats model Rett syndrome, exhibiting disrupted auditory cortical responses and impaired spike timing.
  • Vagus nerve stimulation (VNS) shows potential for normalizing abnormal cortical activity.

Purpose of the Study:

  • To investigate auditory local field potential (LFP) responses in Mecp2+/- rats.
  • To assess the modulatory effects of VNS on auditory cortical activity in this model.

Main Methods:

  • Recorded auditory cortical LFPs in response to speech, noise, and tone stimuli.
  • Compared responses in Mecp2+/- rats, VNS-treated Mecp2+/- rats, and wild-type littermates.
  • Analyzed LFP latency, amplitude, trial-to-trial variability, and oscillatory band power.

Main Results:

  • Mecp2+/- rats displayed delayed, weakened LFP responses with increased variability, particularly for speech stimuli.
  • VNS partially normalized speech-evoked latency/variability and reduced noise-evoked power variability.
  • Tone-evoked responses showed minimal change, indicating selective VNS effects.

Conclusions:

  • Mecp2+/- rats exhibit significant auditory cortical processing deficits.
  • VNS offers potential for partial restoration of cortical function in Rett syndrome.
  • Further research into targeted neuromodulation is warranted for sensory processing abnormalities.