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Updated: Mar 31, 2026

Controlled Cortical Impact Model for Traumatic Brain Injury
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Effect of Traumatic Brain Injury on Sensorimotor Gating.

Melonie N Vaughn1, Jenna M DeWit2, Dean T Acheson3

  • 1Neuroscience Graduate Program, University of California San Diego, La Jolla, California.

Biological Psychiatry. Cognitive Neuroscience and Neuroimaging
|March 29, 2026
PubMed
Summary

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This summary is machine-generated.

Moderate to severe traumatic brain injury (TBI) impairs sensorimotor gating, a key brain function. This finding in humans highlights TBI

Area of Science:

  • Neuroscience
  • Traumatic Brain Injury Research
  • Cognitive Function Studies

Background:

  • Traumatic brain injury (TBI) can lead to long-term cognitive impairments and increase the risk of neuropsychiatric disorders.
  • Sensorimotor gating, measured by prepulse inhibition (PPI) of the startle reflex, is often disrupted in neuropsychiatric conditions.
  • While animal studies suggest TBI impacts PPI, human data has been limited.

Purpose of the Study:

  • To investigate the association between traumatic brain injury (TBI) history and sensorimotor gating in a large human cohort.
  • To determine if TBI severity, blast exposure, or time since injury influences sensorimotor gating.
  • To assess the relationship between TBI, PPI, and acoustic startle habituation.

Main Methods:

  • The Marine Resiliency Study cohort (N=1725) reported TBI history, severity, blast exposure, and related problems.
Keywords:
Prepulse inhibitionSensorimotor gatingService membersTBI severityTraumatic brain injury

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  • Participants underwent assessments of prepulse inhibition (PPI) and acoustic startle habituation.
  • Statistical analyses controlled for neuropsychiatric symptoms, hearing, and baseline startle levels.

    • Main Results:

    • Moderate to severe TBI, unlike mild TBI, was significantly associated with reduced PPI.
    • The most pronounced PPI deficits were observed at shorter interstimulus intervals (30-60ms).
    • Loss of consciousness exceeding 30 minutes was strongly linked to TBI-associated PPI disruption; blast TBI uniquely affected startle habituation.

    Conclusions:

    • Moderate-severe and blast-related TBIs are linked to lasting reductions in sensorimotor gating.
    • Prepulse inhibition (PPI) serves as a valuable cross-species biomarker for TBI-related functional deficits.
    • Further longitudinal research is necessary to understand the role of TBI-induced PPI changes in cognitive decline and neuropsychiatric vulnerability.