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The blink reflex and its modulation - Part 1: Physiological mechanisms.

Markus Kofler1, Mark Hallett2, Gian Domenico Iannetti3

  • 1Department of Neurology, Hochzirl Hospital, Zirl, Austria.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|December 15, 2023
PubMed
Summary

The blink reflex (BR), a protective brainstem circuit, can be modulated in various ways. Understanding these modulations is key for clinical applications in neurophysiology.

Keywords:
AnesthesiaClassical conditioningPainPeripersonal spacePrepulse inhibitionProtective reflex

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Area of Science:

  • Neurophysiology
  • Brainstem Reflexes

Background:

  • The blink reflex (BR) is a crucial protective eye-closure reflex mediated by brainstem circuits.
  • While commonly elicited by electrical stimulation, BR modulation by various sensory inputs is less understood.
  • BR has a significant history in clinical neurophysiology.

Purpose of the Study:

  • To provide a state-of-the-art overview of blink reflex modulation.
  • To explore how different neurophysiological techniques can examine BR modulation.
  • To highlight the importance of understanding BR modulation for clinical applications.

Main Methods:

  • Review of talks from the Brainstem Special Interest Group at the International Congress of Clinical Neurophysiology 2022.
  • Examination of various neurophysiological techniques for BR modulation analysis.
  • Discussion of classical conditioning, prepulse, and paired-pulse stimulation.

Main Results:

  • Various methods, including conditioning and stimulation techniques, can investigate BR modulation.
  • BR can quantify top-down modulation based on stimulus context.
  • Understanding nociceptive and non-nociceptive fiber roles is crucial for neural circuitry insights.

Conclusions:

  • Understanding BR modulation principles is fundamental for valid clinical applications.
  • BRs under general anesthesia may offer insights into brainstem functions not accessible in awake humans.
  • This review consolidates current knowledge on BR physiology and modulation.