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Within-session changes in sensory gating assessed by P50 evoked potentials in normal subjects
J S Lamberti1, S B Schwarzkopf, N Boutros
1Department of Psychiatry, University of Rochester Medical Center, New York.
Progress in Neuro-Psychopharmacology & Biological Psychiatry
|September 1, 1993
Summary
P50 suppression, a measure of sensory gating, dynamically changes within a single session in healthy individuals. This study reveals significant variability, indicating P50 suppression is not static.
Area of Science:
- Neuroscience
- Auditory Processing
Background:
- P50 suppression is a neurophysiological measure used to assess sensory gating.
- Understanding P50 suppression dynamics is crucial for interpreting auditory processing in normal and clinical populations.
Purpose of the Study:
- To investigate within-session changes in P50 suppression.
- To characterize the dynamic nature of P50 suppression in healthy subjects.
Main Methods:
- A conditioning-testing paradigm was employed with 28 healthy participants.
- 120 pairs of high-intensity auditory clicks (110 Db, 0.04 ms duration) were delivered at 500 ms intervals.
- Stimuli were presented binaurally via headphones at 10-second intervals.
Main Results:
- Mean P50 suppression exhibited a significant decline within the session, from 60.5% in the first 30 pairs to -19.1% in the last 30 pairs.
- The overall mean P50 suppression across the entire session was 25.4%.
Conclusions:
- P50 suppression is a dynamic process in normal subjects, not a fixed measure.
- Further research is required to identify the specific factors influencing these within-session P50 suppression changes.