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Differences in Reaction Time Variability on the Senaptec Sensory Station by Concussion Status in Special Operations

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sports Medicine

Background:

  • Computerized cognitive tests are standard in post-concussion evaluation.
  • Central tendency measures in reaction time (RT) have questionable psychometric properties.
  • Cognitive dispersion metrics, like intraindividual variability (IIV), may offer greater concussion sensitivity.

Purpose of the Study:

  • To extract IIV from the Senaptec Sensory Station's Eye-Hand Coordination (EHC) subtest.
  • To compare IIV in service members (SMs) with recent concussion (RC), non-recent concussion (NRC), and concussion-naïve (CN) status.
  • To evaluate the utility of IIV as a sensitive measure for concussion detection.

Main Methods:

  • 391 Special Operations Forces SMs (CN, RC, NRC) completed the Senaptec EHC subtest.
  • Extracted metrics included mean RT, RT standard deviation (SD), and IIV (SD of trial-by-trial RT).
  • Analyzed IIV for total, central, and peripheral stimuli, calculating a disruption metric (SDDiff).

Main Results:

  • Recent concussion (RC) group showed significant differences in RT and IIV compared to NRC and CN groups, particularly for peripheral stimuli.
  • Effect sizes for all significant findings were small (ηp² < 0.04).
  • No significant differences were observed between non-recent concussion (NRC) and concussion-naïve (CN) groups, or for centrally presented stimuli.

Conclusions:

  • IIV from the Senaptec EHC subtest demonstrates some sensitivity to recent concussions, especially with peripheral stimuli.
  • Findings align with previous research on IIV from other cognitive platforms.
  • Cognitive dispersion measures like IIV warrant further investigation for clinical utility in concussion assessment and recovery monitoring.