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In the spotlight: How the brainstem modulates information flow.

Markus Kofler1, Josep Valls-Solé2, Michael Thurner1

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

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|February 21, 2023
PubMed
Summary
This summary is machine-generated.

Prepulse inhibition (PPI) of the blink reflex (BR) does not affect BR excitability recovery (BRER) to paired supraorbital nerve (SON) stimulation. PPI on the secondary BR response depends on the test stimulus, not the initial response size.

Keywords:
Blink reflex excitability recoveryConditioning stimulationPaired-pulse stimulationPrepulse inhibitionTrigeminal blink reflex

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Area of Science:

  • Neuroscience
  • Physiology

Background:

  • The blink reflex (BR) is a protective response to facial stimuli.
  • Prepulse inhibition (PPI) and paired-pulse paradigms are used to study neural excitability.

Purpose of the Study:

  • To investigate how PPI affects BR excitability recovery (BRER) to paired supraorbital nerve (SON) stimulation.
  • To determine if the magnitude of the initial BR response influences the secondary BR response in paired-pulse paradigms.

Main Methods:

  • Electrical prepulses were applied to the index finger 100 ms before the first SON stimulus (SON-1).
  • The second SON stimulus (SON-2) was applied at interstimulus intervals (ISI) of 100, 300, or 500 ms.
  • PPI effects on BRER were analyzed at different ISIs.

Main Results:

  • PPI of the BR to SON-1 was proportional to prepulse intensity but did not affect BRER.
  • PPI was observed on the BR to SON-2 only when prepulses preceded SON-2 directly.
  • The BR response to SON-2 was independent of the BR response size to SON-1.

Conclusions:

  • BR excitability recovery in paired-pulse paradigms is not determined by the preceding BR response size.
  • PPI does not induce lasting inhibitory activity.
  • BR response size to SON-2 depends on SON-1 stimulus intensity, not response magnitude, suggesting caution in clinical BRER applications.