Experienced mindfulness meditators exhibit higher parietal-occipital EEG gamma activity during NREM sleep.
Level 4 - case-series / case-control
Cross-sectional case-control study comparing long-term meditators to naive controls
PubMed 24015304 · doi:10.1371/journal.pone.0073417
What was done
High-density electroencephalography (hdEEG) was recorded during sleep in long-term Buddhist meditation practitioners (mean ~8,700 hours of lifetime practice) and meditation-naive individuals to evaluate neuroplastic differences in spontaneous brain activity during non-rapid eye movement (NREM) sleep.
What was found
Long-term meditators exhibited higher parietal-occipital EEG gamma power during NREM sleep compared to naive controls. This elevation was specific to the 25-40 Hz gamma band, was independent of spontaneous arousals during NREM, and correlated positively with total lifetime hours of daily meditation practice. The abstract provides no exact quantitative values, effect sizes, or confidence intervals.
Why it matters
This indicates that extensive meditation training is linked to neuroplastic modifications in baseline cortical activity that persist outside of active practice and into unconscious states such as NREM sleep.
Limits
The abstract does not state the sample size (n), participant demographics, or exact numerical results. The cross-sectional, non-randomized design cannot definitively prove causality, leaving open the possibility of baseline self-selection differences or unmeasured lifestyle confounders between groups.