Theta Activity and Meditative States: Spectral Changes During Concentrative Meditation

Overview

Journal Cogn Process

Specialty Psychology

Date 2009 Jul 24

PMID 19626355

Citations 58

Authors

Shruti Baijal

Narayanan Srinivasan

Affiliations

Soon will be listed here.

Abstract

Brain oscillatory activity is associated with different cognitive processes and plays a critical role in meditation. In this study, we investigated the temporal dynamics of oscillatory changes during Sahaj Samadhi meditation (a concentrative form of meditation that is part of Sudarshan Kriya yoga). EEG was recorded during Sudarshan Kriya yoga meditation for meditators and relaxation for controls. Spectral and coherence analysis was performed for the whole duration as well as specific blocks extracted from the initial, middle, and end portions of Sahaj Samadhi meditation or relaxation. The generation of distinct meditative states of consciousness was marked by distinct changes in spectral powers especially enhanced theta band activity during deep meditation in the frontal areas. Meditators also exhibited increased theta coherence compared to controls. The emergence of the slow frequency waves in the attention-related frontal regions provides strong support to the existing claims of frontal theta in producing meditative states along with trait effects in attentional processing. Interestingly, increased frontal theta activity was accompanied reduced activity (deactivation) in parietal-occipital areas signifying reduction in processing associated with self, space and, time.

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References

Klimesch W . EEG alpha and theta oscillations reflect cognitive and memory performance: a review and analysis. Brain Res Brain Res Rev. 1999; 29(2-3):169-95. DOI: 10.1016/s0165-0173(98)00056-3. View

Onton J, Delorme A, Makeig S . Frontal midline EEG dynamics during working memory. Neuroimage. 2005; 27(2):341-56. DOI: 10.1016/j.neuroimage.2005.04.014. View

Travis F, Haaga D, Hagelin J, Tanner M, Arenander A, Nidich S . A self-referential default brain state: patterns of coherence, power, and eLORETA sources during eyes-closed rest and Transcendental Meditation practice. Cogn Process. 2009; 11(1):21-30. DOI: 10.1007/s10339-009-0343-2. View

Holzel B, Ott U, Hempel H, Hackl A, Wolf K, Stark R . Differential engagement of anterior cingulate and adjacent medial frontal cortex in adept meditators and non-meditators. Neurosci Lett. 2007; 421(1):16-21. DOI: 10.1016/j.neulet.2007.04.074. View

Banquet J . Spectral analysis of the EEG in meditation. Electroencephalogr Clin Neurophysiol. 1973; 35(2):143-51. DOI: 10.1016/0013-4694(73)90170-3. View

Wallace R . Physiological effects of transcendental meditation. Science. 1970; 167(3926):1751-4. DOI: 10.1126/science.167.3926.1751. View

Travis F, Tecce J, Arenander A, Wallace R . Patterns of EEG coherence, power, and contingent negative variation characterize the integration of transcendental and waking states. Biol Psychol. 2002; 61(3):293-319. DOI: 10.1016/s0301-0511(02)00048-0. View

Cahn B, Polich J . Meditation states and traits: EEG, ERP, and neuroimaging studies. Psychol Bull. 2006; 132(2):180-211. DOI: 10.1037/0033-2909.132.2.180. View

Beauregard M, Paquette V . EEG activity in Carmelite nuns during a mystical experience. Neurosci Lett. 2008; 444(1):1-4. DOI: 10.1016/j.neulet.2008.08.028. View

10.

Basar-Eroglu C, Basar E, Demiralp T, Schurmann M . P300-response: possible psychophysiological correlates in delta and theta frequency channels. A review. Int J Psychophysiol. 1992; 13(2):161-79. DOI: 10.1016/0167-8760(92)90055-g. View

11.

Jha A, Krompinger J, Baime M . Mindfulness training modifies subsystems of attention. Cogn Affect Behav Neurosci. 2007; 7(2):109-19. DOI: 10.3758/cabn.7.2.109. View

12.

Babiloni C, Babiloni F, Carducci F, Cappa S, Cincotti F, Percio C . Human cortical responses during one-bit short-term memory. A high-resolution EEG study on delayed choice reaction time tasks. Clin Neurophysiol. 2004; 115(1):161-70. DOI: 10.1016/s1388-2457(03)00286-4. View

13.

Gevins A, Smith M, McEvoy L, Yu D . High-resolution EEG mapping of cortical activation related to working memory: effects of task difficulty, type of processing, and practice. Cereb Cortex. 1997; 7(4):374-85. DOI: 10.1093/cercor/7.4.374. View

14.

Travis F, Wallace R . Autonomic and EEG patterns during eyes-closed rest and transcendental meditation (TM) practice: the basis for a neural model of TM practice. Conscious Cogn. 1999; 8(3):302-18. DOI: 10.1006/ccog.1999.0403. View

15.

Khare K, Nigam S . A study of electroencephalogram in meditators. Indian J Physiol Pharmacol. 2000; 44(2):173-8. View

16.

Pan W, Zhang L, Xia Y . The difference in EEG theta waves between concentrative and non-concentrative qigong states--a power spectrum and topographic mapping study. J Tradit Chin Med. 1994; 14(3):212-8. View

17.

Travis F, TECCE J, Guttman J . Cortical plasticity, contingent negative variation, and transcendent experiences during practice of the Transcendental Meditation technique. Biol Psychol. 2000; 55(1):41-55. DOI: 10.1016/s0301-0511(00)00063-6. View

18.

Krause C, Sillanmaki L, Koivisto M, Saarela C, Haggqvist A, Laine M . The effects of memory load on event-related EEG desynchronization and synchronization. Clin Neurophysiol. 2000; 111(11):2071-8. DOI: 10.1016/s1388-2457(00)00429-6. View

19.

Weiss S, Muller H, Rappelsberger P . Theta synchronization predicts efficient memory encoding of concrete and abstract nouns. Neuroreport. 2000; 11(11):2357-61. DOI: 10.1097/00001756-200008030-00005. View

20.

Deepak K, MANCHANDA S, Maheshwari M . Meditation improves clinicoelectroencephalographic measures in drug-resistant epileptics. Biofeedback Self Regul. 1994; 19(1):25-40. DOI: 10.1007/BF01720668. View