Magnetoencephalography

Publication Title: 
Journal of Alternative and Complementary Medicine (New York, N.Y.)

Acupuncture is an ancient East Asian healing modality that has been in use for more than 2000 years. Unfortunately, its mechanisms of action are not well understood, and controversy regarding its clinical efficacy remains. Importantly, acupuncture needling often evokes complex somatosensory sensations and may modulate the cognitive/affective perception of pain, suggesting that many effects are supported by the brain and extending central nervous system (CNS) networks.

Author(s): 
Dhond, Rupali P.
Kettner, Norman
Napadow, Vitaly
Publication Title: 
International Journal of Psychophysiology: Official Journal of the International Organization of Psychophysiology

The engagement of different brain regions which implement subjectively experienced emotional states in normals is not completely clarified. Emotional states can conveniently be induced by hypnosis-based suggestions. We studied brain electric activity during hypnotically induced anxiety and relaxation in 11 right-handed normals (5 males, 6 females, mean age 26.5+/-7.6 years). After induction of light hypnosis, anxiety and then relaxation was suggested using a standardized text (reverse sequence in half of the subjects).

Author(s): 
Isotani, T.
Tanaka, H.
Lehmann, D.
Pascual-Marqui, R. D.
Kochi, K.
Saito, N.
Yagyu, T.
Kinoshita, T.
Sasada, K.
Publication Title: 
Consciousness and Cognition

Here we report that a specific form of yoga can generate controlled high-frequency gamma waves. For the first time, paroxysmal gamma waves (PGW) were observed in eight subjects practicing a yoga technique of breathing control called Bhramari Pranayama (BhPr). To obtain new insights into the nature of the EEG during BhPr, we analyzed EEG signals using time-frequency representations (TFR), independent component analysis (ICA), and EEG tomography (LORETA). We found that the PGW consists of high-frequency biphasic ripples.

Author(s): 
Vialatte, François B.
Bakardjian, Hovagim
Prasad, Rajkishore
Cichocki, Andrzej
Publication Title: 
European Journal of Pain (London, England)

We recorded magnetoencephalography (MEG) and functional magnetic resonance imaging (fMRI) following noxious laser stimulation in a Yoga Master who claims not to feel pain when meditating. As for background MEG activity, the power of alpha frequency bands peaking at around 10 Hz was much increased during meditation over occipital, parietal and temporal regions, when compared with the non-meditative state, which might mean the subject was very relaxed, though he did not fall asleep, during meditation.

Author(s): 
Kakigi, Ryusuke
Nakata, Hiroki
Inui, Koji
Hiroe, Nobuo
Nagata, Osamu
Honda, Manabu
Tanaka, Satoshi
Sadato, Norihiro
Kawakami, Mitsumasa
Publication Title: 
Journal of Alternative and Complementary Medicine (New York, N.Y.)

Acupuncture is an ancient East Asian healing modality that has been in use for more than 2000 years. Unfortunately, its mechanisms of action are not well understood, and controversy regarding its clinical efficacy remains. Importantly, acupuncture needling often evokes complex somatosensory sensations and may modulate the cognitive/affective perception of pain, suggesting that many effects are supported by the brain and extending central nervous system (CNS) networks.

Author(s): 
Dhond, Rupali P.
Kettner, Norman
Napadow, Vitaly
Publication Title: 
Journal of Alternative and Complementary Medicine (New York, N.Y.)

Acupuncture is an ancient Eastern healing modality with putative therapeutic applications. Unfortunately, little is known about the central mechanisms by which acupuncture may exert its effects. In this study, 16 [corrected] healthy subjects were evaluated with magnetoencephalography (MEG) to map the location and timing of brain activity during low-frequency electroacupuncture (EA) and mechanical, noninsertive, sham acupuncture (SA) given at acupoint PC-6. Both EA and SA evoked brain responses that localized to contralateral primary somatosensory (SI) cortex.

Author(s): 
Dhond, Rupali P.
Witzel, Thomas
Hämäläinen, Matti
Kettner, Norman
Napadow, Vitaly
Publication Title: 
The Journal of Neuroscience: The Official Journal of the Society for Neuroscience

Cued spatial attention modulates functionally relevant alpha rhythms in visual cortices in humans. Here, we present evidence for analogous phenomena in primary somatosensory neocortex (SI). Using magnetoencephalography, we measured changes in the SI mu rhythm containing mu-alpha (7-14 Hz) and mu-beta (15-29 Hz) components.

Author(s): 
Jones, Stephanie R.
Kerr, Catherine E.
Wan, Qian
Pritchett, Dominique L.
Hämäläinen, Matti
Moore, Christopher I.
Publication Title: 
BMC neuroscience

BACKGROUND: FMRI studies focus on sub-cortical effects of acupuncture stimuli. The purpose of this study was to assess changes in primary somatosensory (S1) activity over the course of different types of acupuncture stimulation. We used whole head magnetoencephalography (MEG) to map S1 brain response during 15 minutes of electroacupuncture (EA) and acupressure (AP). We further assessed how brain response changed during the course of stimulation.

Author(s): 
Witzel, Thomas
Napadow, Vitaly
Kettner, Norman W.
Vangel, Mark G.
Hämäläinen, Matti S.
Dhond, Rupali P.
Publication Title: 
PloS One

BACKGROUND: Behavioral paradigms applied during human recordings in electro- and magneto- encephalography (EEG and MEG) typically require 1-2 hours of data collection. Over this time scale, the natural fluctuations in brain state or rapid learning effects could impact measured signals, but are seldom analyzed. METHODS AND FINDINGS: We investigated within-session dynamics of neocortical alpha (7-14 Hz) rhythms and their allocation with cued-attention using MEG recorded from primary somatosensory neocortex (SI) in humans.

Author(s): 
Wan, Qian
Kerr, Catherine
Pritchett, Dominique
Hämäläinen, Matti
Moore, Christopher
Jones, Stephanie
Publication Title: 
Brain: A Journal of Neurology

Neuroimaging data demonstrate that carpal tunnel syndrome, a peripheral neuropathy, is accompanied by maladaptive central neuroplasticity. To further investigate this phenomenon, we collected magnetoencephalography data from 12 patients with carpal tunnel syndrome and 12 healthy control subjects undergoing somatosensory stimulation of the median nerve-innervated Digits 2 and 3, as well as Digit 5, which is innervated by the ulnar nerve. Nerve conduction velocity and psychophysical data were acquired to determine whether standard clinical measures correlated with brain response.

Author(s): 
Dhond, Rupali P.
Ruzich, Emily
Witzel, Thomas
Maeda, Yumi
Malatesta, Cristina
Morse, Leslie R.
Audette, Joseph
Hämäläinen, Matti
Kettner, Norman
Napadow, Vitaly

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