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Soc Cogn Affect Neurosci. 2013 Jan;8(1):100-11. doi: 10.1093/scan/nss060. Epub 2012 May 29.

Event-related delta, theta, alpha and gamma correlates to auditory oddball processing during Vipassana meditation.

Author information

1
Department of Psychiatry, University of California, Irvine, Irvine, CA 92868, USA. rael.cahn@gmail.com

Abstract

Long-term Vipassana meditators sat in meditation vs. a control (instructed mind wandering) states for 25 min, electroencephalography (EEG) was recorded and condition order counterbalanced. For the last 4 min, a three-stimulus auditory oddball series was presented during both meditation and control periods through headphones and no task imposed. Time-frequency analysis demonstrated that meditation relative to the control condition evinced decreased evoked delta (2-4 Hz) power to distracter stimuli concomitantly with a greater event-related reduction of late (500-900 ms) alpha-1 (8-10 Hz) activity, which indexed altered dynamics of attentional engagement to distracters. Additionally, standard stimuli were associated with increased early event-related alpha phase synchrony (inter-trial coherence) and evoked theta (4-8 Hz) phase synchrony, suggesting enhanced processing of the habituated standard background stimuli. Finally, during meditation, there was a greater differential early-evoked gamma power to the different stimulus classes. Correlation analysis indicated that this effect stemmed from a meditation state-related increase in early distracter-evoked gamma power and phase synchrony specific to longer-term expert practitioners. The findings suggest that Vipassana meditation evokes a brain state of enhanced perceptual clarity and decreased automated reactivity.

PMID:
22648958
PMCID:
PMC3541491
DOI:
10.1093/scan/nss060
[Indexed for MEDLINE]
Free PMC Article

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