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Related Experiment Video

Updated: Jun 8, 2025

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Intraclass Correlation in Paired Associative Stimulation and Metaplasticity.

Giuditta Schapira1, Justin Chang1, Yeun Kim1

  • 1Ahmanson-Lovelace Brain Mapping Center, Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.

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|November 1, 2024
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Summary
This summary is machine-generated.

Paired associative stimulation (PAS) shows good reproducibility within sessions but poor reproducibility between sessions. This suggests long-term neuroplasticity effects may impact the reliability of this brain stimulation technique over time.

Keywords:
long-term potentiationreliabilityspike-timing-dependent plasticitytranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Neurophysiology
  • Brain Stimulation

Background:

  • Paired associative stimulation (PAS) is a common noninvasive brain stimulation method.
  • Assessing the reproducibility of PAS is crucial for its reliable application.
  • Previous studies on PAS reproducibility have yielded inconsistent results.

Purpose of the Study:

  • To systematically assess the reproducibility of PAS in healthy volunteers.
  • To investigate within-session and between-session reliability of PAS.
  • To identify potential factors affecting PAS reproducibility.

Main Methods:

  • Two separate studies were conducted on healthy participants.
  • Intraclass correlation coefficients (ICCs) were used to measure reproducibility.
  • Study 1: Five PAS sessions, 10 MEPs recorded every 10 min for 1 hour post-PAS.
  • Study 2: Two PAS sessions, 50 MEPs recorded at 20 and 50 min post-PAS.

Main Results:

  • Within-session ICCs were fair to excellent in both studies.
  • Between-session ICCs were poor in both studies.
  • PAS sessions were separated by one week.

Conclusions:

  • PAS demonstrates good reliability for measurements taken within a single session.
  • The poor between-session reproducibility suggests potential interference from longer-term neuroplasticity.
  • Further research is needed to understand and mitigate the impact of meta-plasticity on PAS reliability.