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 PET and electromagnetic tomography (LORETA) during partial status epilepticus

Zumsteg, Dominik; Wennberg, Richard; Treyer, Valérie; Buck, A. C.; Wieser, Heinz Gregor

doi:10.1212/01.wnl.0000184516.32369.1a

Cited by 120 publications

(76 citation statements)

References 10 publications

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“…For instance, excellent localization agreement has been reported in multimodal imaging studies with functional MRI (Mulert et al, 2004;Vitacco et al, 2002), structural MRI (Worrell et al, 2000), and PET (e.g. Dierks et al, 2000;Zumsteg et al, 2005). Further validation based on accepting as "ground truth" the information provided by intracranial recordings in humans has been reported in a number of papers (e.g.…”

Section: Data Conditioningmentioning

confidence: 92%

Reduced functional connectivity between cortical sources in five meditation traditions detected with lagged coherence using EEG tomography

Lehmann¹,

Faber²,

Tei

et al. 2012

NeuroImage

137

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Brain functional states are established by functional connectivities between brain regions. In experienced meditators (13 Tibetan Buddhists, 15 QiGong, 14 Sahaja Yoga, 14 Ananda Marga Yoga, 15 Zen), 19-channel EEG was recorded before, during and after that meditation exercise which their respective tradition regards as route to the most desirable meditative state. The head surface EEG data were recomputed (sLORETA) into 19 cortical regional source model time series. All 171 functional connectivities between regions were computed as 'lagged coherence' for the eight EEG frequency bands (delta through gamma). This analysis removes ambiguities of localization, volume conduction-induced inflation of coherence, and reference-dependence. All significant differences (corrected for multiple testing) between meditation compared to no-task rest before and after meditation showed lower coherence during meditation, in all five traditions and eight (inhibitory as well as excitatory) frequency bands. Conventional coherence between the original head surface EEG time series very predominantly also showed reduced coherence during meditation. The topography of the functional connectivities was examined via PCAbased computation of principal connectivities. When going into and out of meditation, significantly different connectivities revealed clearly different topographies in the delta frequency band and minor differences in the beta-2 band. The globally reduced functional interdependence between brain regions in meditation suggests that interaction between the self process functions is minimized, and that constraints on the self process by other processes are minimized, thereby leading to the subjective experience of noninvolvement, detachment and letting go, as well as of all-oneness and dissolution of ego borders during meditation. AbstractBrain functional states are established by functional connectivities between brain regions. In experienced meditators (13 Tibetan Buddhists, 15 QiGong, 14 Sahaja Yoga, 14 Ananda Marga Yoga, 15 Zen), 19-channel EEG was recorded before, during and after that meditation exercise which their respective tradition regards as route to the most desirable meditative state. The head surface EEG data were recomputed (sLORETA) into 19 cortical regional source model time series. All 171 functional connectivities between regionswere computed as 'lagged coherence' for the eight EEG frequency bands (delta through gamma). This analysis removes ambiguities of localization, volume conduction-induced inflation of coherence, and reference-dependence. All significant differences (corrected for multiple testing) between meditation compared to no-task rest before and after meditation showed lower coherence during meditation, in all five traditions and eight (inhibitory as well as excitatory) frequency bands. Conventional coherence between the original head surface EEG time series very predominantly also showed reduced coherence during meditation. The topography of the functional connectivities was examined ...

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Section: Data Conditioningmentioning

confidence: 92%

Reduced functional connectivity between cortical sources in five meditation traditions detected with lagged coherence using EEG tomography

Lehmann¹,

Faber²,

Tei

et al. 2012

NeuroImage

137

View full text Add to dashboard Cite

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“…The tomography sLORETA has received considerable validation from studies combining LORETA with other more established localization methods including functional magnetic resonance imaging (fMRI) (Mulert et al 2004b;Vitacco et al 2002) and positron emission tomography (Dierks et al 2000;Pizzagalli et al 2004;Zumsteg et al 2005). It is now widely used in studies involving time and frequency domain analysis (Shao et al 2012;Volpe et al 2007;Zumsteg et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Cortical activities of heat-sensitization responses in suspended moxibustion: an EEG source analysis with sLORETA

Wang

Zhang

et al. 2015

Cogn Neurodyn

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Moxibustion is under active research as a complementary and alternative treatment for various diseases such as pain. ''Heat-sensitization'' responses have been reported during suspended moxibustion, whose occurrence is associated with significantly better therapeutic effects. The present study aimed to investigate the cortical activities of this interesting phenomenon by a standardized low-resolution brain electromagnetic tomography. We performed electroencephalography recording in a group of patients with chronic low back pain before, during, and after moxibustion treatment at Yaoyangguan (DU3) areas. 11 out of 21 subjects experienced strong heatsensitization during moxibustion, which were accompanied with significant decreases of current densities in the beta frequency bands in prefrontal, primary and second somatosensory, and cingulate cortices, as well as increased current densities in the alpha2 band in the left insula. No changes were detected in patients without sensitization responses, or in the post-moxibustion phase of either group. These data indicated widespread activity changes across different frequency bands during heat-sensitization. Cortical oscillatory activities could be used to evaluate the ''heatsensitization'' responses during suspended moxibustion.

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“…fMRI 16 , PET 17,18 ; and CT 19 . Included in the Neurometric normative EEG data base is that different normative equations exist for EEG across the human lifespan.…”

Section: Neurometrics -Eeg Data Acquisition and Neurometric Analysismentioning

confidence: 99%

New Concepts in Electrophysiology and Tinnitus

Hoffer

Goldstein

Shulman

2013

The International Tinnitus Journal

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International Tinnitus Miniseminar, 2013, was "New Concepts Electrophysiology and Tinnitus".The goal was to provide to the otolaryngologist and all tinnitus professionals information of clinically applicable new and established methods of objective recording of electrical activity in both ear and brain which can serve as a basis for identification of electro physiologic correlate(s), for all clinical types of tinnitus, individual for each tinnitus patient.The focus was on the clinical translation for tinnitus diagnosis and treatment based on: 1) State of the art clinical translation of electrophysiology of brain activity reflective of multiple brain functions in the presence of the tinnitus signal; and 2) Electrophysiology of cochleovestibular function reflective of endolymphatic hydrops, and sensorineural hearing loss.Michael E. Hoffer, M.D. introduced the program to the well attended meeting. The program in 2013, "Electrophysiology and tinnitus", was presented as the fourth of a series of AAO-HNS Miniseminars, which over the past 4 years has had as its goal the providing to the AAO HNS membership and guests of state of the art tinnitus information, both clinical and basic science, for translation by the otolaryngology practioner to the patient for an increased accuracy for the tinnitus diagnosis and its translation for treatment.The invited speakers included: -Michael E. Hoffer, M.D. CAPT MC USN -Guest of Honor: Leslie S. Prichep, PhD., Professor Psychiatry, Acting

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H ₂ ¹⁵ O or ¹³ NH ₃ PET and electromagnetic tomography (LORETA) during partial status epilepticus

Cited by 120 publications

References 10 publications

Reduced functional connectivity between cortical sources in five meditation traditions detected with lagged coherence using EEG tomography

Reduced functional connectivity between cortical sources in five meditation traditions detected with lagged coherence using EEG tomography

Cortical activities of heat-sensitization responses in suspended moxibustion: an EEG source analysis with sLORETA

New Concepts in Electrophysiology and Tinnitus

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H 2 15 O or 13 NH 3 PET and electromagnetic tomography (LORETA) during partial status epilepticus

Cited by 120 publications

References 10 publications

Reduced functional connectivity between cortical sources in five meditation traditions detected with lagged coherence using EEG tomography

Reduced functional connectivity between cortical sources in five meditation traditions detected with lagged coherence using EEG tomography

Cortical activities of heat-sensitization responses in suspended moxibustion: an EEG source analysis with sLORETA

New Concepts in Electrophysiology and Tinnitus

Contact Info

Product

Resources

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H ₂ ¹⁵ O or ¹³ NH ₃ PET and electromagnetic tomography (LORETA) during partial status epilepticus