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Published on: November 11, 2017
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.
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.
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.
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