Related Experiment Videos
Cross-modal generality of the gating deficit
J Christopher Edgar1, Gregory A Miller, Sandra N Moses
1Department of Psychology and Beckman Institute Biomedical Imaging Center, University of Illinois at Urbana-Champaign, Urbana, IL 61820, USA. cedgar@tx.psych.uiuc.edu
Psychophysiology
|June 10, 2005
Summary
Schizophrenia patients exhibit abnormal auditory sensory gating but normal somatosensory gating in primary somatosensory cortex, challenging the idea of a widespread sensory gating deficit across modalities.
Area of Science:
- Neuroscience
- Psychiatry
- Sensory Processing
Background:
- Schizophrenia is linked to impaired auditory sensory gating (P50/M50 response).
- The cross-modal generality of this sensory gating deficit remains largely unstudied.
Purpose of the Study:
- To investigate somatosensory gating in primary somatosensory cortex (area 3b) in schizophrenia patients.
- To determine if sensory gating deficits extend beyond the auditory modality.
Main Methods:
- Magnetoencephalography (MEG) data collected from 27 schizophrenia patients and 21 controls.
- Somatosensory paired-pulse paradigm with 75- or 500-ms interstimulus intervals.
- Magnetic source imaging used to localize M20 somatosensory responses and calculate gating ratios.
Main Results:
- Schizophrenia patients demonstrated abnormal auditory M50 gating.
- Patients showed normal M20 somatosensory gating in primary somatosensory cortex.
- No evidence of a cross-modal sensory gating deficit at this early cortical processing stage.
Conclusions:
- The findings suggest that sensory gating deficits in schizophrenia may be modality-specific.
- Results argue against a generalized cross-modal gating deficit in primary somatosensory cortex.