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Updated: Apr 18, 2026
P50 Sensory Gating in Infants
Published on: December 26, 2013
Stability of P50 auditory sensory gating during sleep from infancy to 4 years of age
Sharon K Hunter1, Sabreena J Gillow2, Randal G Ross1
1Department of Psychiatry, University of Colorado Denver, Aurora, CO, USA.
Insights
Cerebral inhibition stability in children was measured using P50 event-related potentials (ERPs) during sleep. The sensory gating measure showed reliability during REM sleep, suggesting its potential as a biomarker for brain development and psychiatric risk.
Area of Science:
- Neuroscience
- Developmental Psychology
- Psychiatry
Background:
- Assessing cerebral inhibition is crucial for understanding brain development.
- Sensory gating paradigms, like the P50 ERP, offer insights into neural processing.
- Early childhood is a critical period for brain maturation and the emergence of psychiatric vulnerabilities.
Purpose of the Study:
- To evaluate the stability of cerebral inhibition across early childhood.
- To determine if P50 sensory gating is a reliable measure in developing brains.
- To explore the influence of sleep stage on sensory gating during early development.
Main Methods:
- A paired-click auditory sensory gating paradigm was employed.
- P50 event-related potentials (ERPs) were recorded in 14 children at ~3 months and ~4 years of age.
- Measurements included evoked response amplitudes, latencies, and the S2/S1 ratio during REM (active sleep) and NREM sleep.
Main Results:
- The S2/S1 ratio demonstrated significant reliability during REM sleep (r = .73, p = .003), but not NREM sleep (r = -.05, p = .88).
- A significant interaction indicated that the response to the second stimulus decreased during REM sleep, but not NREM sleep.
- These findings suggest age-independent stability of P50 sensory gating during REM sleep, highlighting its sleep-state dependency.
Conclusions:
- P50 sensory gating is a stable and reliable biomarker during REM sleep in early childhood.
- This measure is not affected by age but is dependent on sleep stage.
- P50 sensory gating may serve as a valuable tool for exploring neurodevelopmental changes and screening for psychiatric illness vulnerability.
Abstract:
The stability of cerebral inhibition was assessed across early childhood using a paired-click auditory sensory gating paradigm. The P50 ERP was measured during REM (or its infant analogue, active sleep) and NREM sleep in 14 children at approximately 3 months of age and again at approximately 4 years of age. Evoked response amplitudes, latencies, and the S2/S1 ratio of the amplitudes of the evoked responses were compared between the two visits. Significant reliability was found for the S2/S1 ratio (r = .73, p = .003) during REM but not non REM sleep (r = -.05, p = .88). A significant stimulus number by sleep stage interaction (F(1,12) = 17.1, p = .001) demonstrated that the response to the second stimulus decreased during REM but not NREM sleep. These findings suggest that this measure is stable during REM sleep across early childhood, is not affected by age, and is sleep-state dependent. P50 sensory gating is a biomarker which, if used properly, may provide a mechanism to further explore changes in the developing brain or may help with early screening for psychiatric illness vulnerability.
