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P50 Sensory Gating in Infants
Published on: December 26, 2013
Auditory gating deficit to human voices in schizophrenia: a MEG study
Yoji Hirano1, Shogo Hirano, Toshihiko Maekawa
1Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
Schizophrenia Research
|September 29, 2009
Summary
Schizophrenia patients exhibit auditory gating deficits to human voices, particularly in the left hemisphere. This impairment is linked to increased auditory hallucinations and negative symptoms, suggesting sensory overload in the auditory cortex.
Area of Science:
- Neuroscience
- Psychiatry
- Auditory Processing
Background:
- Schizophrenia is characterized by auditory gating deficits.
- The P50 auditory gating response to human voices and its clinical correlations in schizophrenia remain under-investigated.
Purpose of the Study:
- To examine auditory gating functioning in schizophrenia patients using human voice stimuli.
- To investigate the relationship between P50 auditory gating and clinical symptoms in schizophrenia.
Main Methods:
- Magnetoencephalography (MEG) was used to record auditory evoked responses (P50m, N100m) to voice stimuli.
- 22 schizophrenia patients and 28 healthy controls participated.
- P50m gating ratios were calculated and correlated with clinical symptom severity.
Main Results:
- Schizophrenia patients demonstrated significantly higher P50m gating ratios to human voices in the left hemisphere.
- Increased left P50m gating ratios correlated with more severe auditory hallucinations.
- Increased right P50m gating ratios correlated with more severe negative symptoms.
Conclusions:
- Schizophrenia patients exhibit auditory gating deficits specific to human voices in the left hemisphere.
- Auditory hallucinations in schizophrenia may stem from sensory overload to human voices within the auditory cortex.
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