EEG gamma coherence and other correlates of subjective reports during ayahuasca experiences.

Abstract:

:The current study examined QEEG power and coherence of ayahuasca experiences with two experienced participants in a Brazilian jungle setting. An exploratory case series design was adopted for naturalistic field research. EEGs recorded during visual imagery was compared to eyes-closed baselines. The most important findings were increases in global EEG coherence in the 36-44 Hz and 50-64 Hz frequency bands for both subjects. Widely distributed cortical hyper-coherence seems reasonable given the intense synesthesia during ayahuasca experiences. Other findings include increased modal EEG alpha frequency and global power decreases across the cortex in most frequency bands, which concur with the EEG of psychedelics literature. Exploratory analysis revealed the usefulness of analyzing single Hz bins over the standard wide-band analysis. The discovery-oriented naturalistic approach developed for this study resulted in potentially important findings. We believe that finding increases in global gamma coherence during peak psychedelic experiences might contribute to the discussion of binding theory. Also, in light of recent research with gamma coherence during advanced meditative conditions, our findings might further the comparison of shamanic psychedelic practices with meditation.

journal_name

J Psychoactive Drugs

authors

Stuckey DE,Lawson R,Luna LE

doi

10.1080/02791072.2005.10399798

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

163-78

issue

2

eissn

0279-1072

issn

2159-9777

journal_volume

37

pub_type

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