WOBIB: 22 - Lou, et al. (1999) A 15O-H2O PET study of m ...
 
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Hans C. Lou; Troels W. Kjaer; Lars Friberg; G. Wildschiodtz; Søren Holm; Markus Nowak. A 15O-H2O PET study of meditation and the resting state of normal consciousness. Human Brain Mapping 7(2):98-105, 1999. PMID: 9950067. WOBIB: 22.

The aim of the present study was to examine whether the neural structures subserving meditation can be reproducibly measured, and, if so, whether they are different from those supporting the resting state of normal consciousness. Cerebral blood flow distribution was investigated with the 15O-H20 PET technique in nine young adults, who were highly experienced yoga teachers, during the relaxation meditation (Yoga Nidra), and during the resting state of normal consciousness. In addition, global CBF was measured in two of the subjects. Spectral EEG analysis was performed throughout the investigations. In meditation, differential activity was seen, with the noticeable exception of V1, in the posterior sensory and associative cortices known to participate in imagery tasks. In the resting state of normal consciousness (compared with meditation as a baseline), differential activity was found in dorso-lateral and orbital frontal cortex, anterior cingulate gyri, left temporal gyri, left inferior parietal lobule, striatal and thalamic regions, pons and cerebellar vermis and hemispheres, structures thought to support an executive attentional network. The mean global flow remained unchanged for both subjects throughout the investigation (39+/-5 and 38+/-4 ml/100 g/min, uncorrected for partial volume effects). It is concluded that the (H2)15O PET method may measure CBF distribution in the meditative state as well as during the resting state of normal consciousness, and that characteristic patterns of neural activity support each state. These findings enhance our understanding of the neural basis of different aspects of consciousness.

Asymmetry: 0.00000 (left: -1, right: +1)

VRML2 file (142 Kb)

1 Meditation with bodily sensation versus resting. Yoga Nidra: verbal guidance to the experience of the weight of individual body parts. WOEXP: 67.
2 Meditation with abstract sense of joy versus resting. Yoga Nidra: Verbal guidance to the experience of joy and happiness in abstract form. WOEXP: 68.
3 Meditation with visual imagery of landscape versus resting. Yoga Nidra: verbal guidance to the visual guidance of a summer landscape with forests, streams, and meadows with cattle. WOEXP: 69.
4 Meditation with symbolic representation of the self versus resting. Yoga Nidra: Verbal guidance to the abstract perception of the self: symbolized with a golden egg. WOEXP: 70.
5 Meditation versus resting. Yoga Nidra: Combined meditative stages. WOEXP: 71.


corner cube of WOBIB_22

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