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Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.

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Characteristic cortical alterations in auditory neuropathy: An EEG study.

Xin Zhou1, Xiaonan Wu1, Suwei Ma2

  • 1Department of Audio-Vestibular Medicine, Senior Department of Otolaryngology-Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital 100048, Beijing, China; State Key Laboratory of Hearing and Balance Science 100853, Beijing, China; National Clinical Research Center for Otolaryngologic Diseases, Medical School of Chinese PLA, Chinese PLA General Hospital 100853, Beijing, China.

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|November 13, 2025
PubMed
Summary

Auditory neuropathy (AN) shows unique brain activity patterns, distinct from sensorineural hearing loss (SNHL), indicating neural compensation. These findings suggest AN involves cortical reorganization specific to neural dyssynchrony, not just reduced auditory input.

Keywords:
Auditory neuropathyElectroencephalogramNormal hearingResting and auditory task statesSensorineural hearing loss

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Area of Science:

  • Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • Auditory neuropathy (AN) is a hearing disorder impacting speech discrimination.
  • It significantly affects communication and quality of life.
  • Understanding AN's neural basis is crucial for effective management.

Purpose of the Study:

  • To investigate and compare the neural mechanisms of auditory neuropathy (AN) with sensorineural hearing loss (SNHL) and normal hearing (NH).
  • To explore differences in brain activity, network attributes, and cortical organization using electroencephalography (EEG).
  • To correlate EEG findings with audiological indicators in AN patients.

Main Methods:

  • Comprehensive audiological and high-density electroencephalography (EEG) measurements were performed on 21 AN, 21 SNHL, and 21 NH subjects.
  • EEG data analyzed included topological network attributes, microstates, event-related potentials (ERPs), cortical lateralization, and functional connectivity.
  • Comparisons were made in resting and auditory task states, with correlations to audiological measures.

Main Results:

  • In resting state, SNHL showed higher microstate A global field power (GFP) than AN and NH.
  • During auditory tasks, AN exhibited shorter N1 latency than SNHL, correlating with low-frequency hearing loss.
  • AN displayed unique left-hemispheric lateralization and distinct cortical activation patterns compared to SNHL and NH.

Conclusions:

  • Auditory neuropathy (AN) presents unique neural compensation patterns, differing significantly from sensorineural hearing loss (SNHL).
  • Findings support the hypothesis of cortical reorganization specific to neural dyssynchrony in AN.
  • These insights differentiate AN from conditions solely due to auditory input reduction.