A comparative evaluation of signal quality between a research-grade and a wireless dry-electrode mobile EEG system

Marini, Francesco; Lee, Clement; Wagner, Johanna; Makeig, Scott; Gola, Mateusz

doi:10.1088/1741-2552/ab21f2

Cited by 45 publications

(49 citation statements)

References 53 publications

(7 reference statements)

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“…The current study used a small, portable, wireless, battery-powered, dry-electrode system that has excellent sensitivity compared to gellead systems. 3 The main finding is that electroencephalography and clinical data combined are better than either alone for identifying acute stroke/TIA and LVO. As a proofof-concept study, this is a first step towards demonstrating the feasibility of electroencephalography in the prehospital setting.…”

Section: Discussionmentioning

confidence: 99%

“…Four predictor models were evaluated and validated, using acute stroke/TIA (or not) as the dependent measure: (1) clinical data only, using 4 measures that would be available to an Emergency Medical Technician (age, sex, time from last-knownwell to electroencephalography, and Rapid Arterial Occlusion Evaluation score 4 ), using logistic regression modeling; (2) electroencephalography data only, using the Lasso-selected 4 electroencephalography lead-band pairs (F8-T4 alpha, C3-F3 low beta, Cz-C3 high beta, and C4-F4 high beta band), using logistic regression modeling; (3) combined clinical and electroencephalography data using logistic regression, using the most significant clinical predictor from model (1) and Rapid Arterial Occlusion Evaluation score, plus the 4 Lasso-selected electroencephalography lead-band pairs; and (4) combined clinical and electroencephalography data using a deep learning neural network model, using the same six variables as model (3).…”

Section: Statistical Analysesmentioning

confidence: 99%

“…To date, electroencephalography has had limited clinical application due to the technical expertise and long times needed to apply gel electrodes. However, advances in electroencephalography technology, including rapidly applied dry-electrodes, 3 suggest feasibility of prehospital electroencephalography recordings.…”

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confidence: 99%

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Electroencephalography Might Improve Diagnosis of Acute Stroke and Large Vessel Occlusion

Erani

Zolotova

Vanderschelden

et al. 2020

Stroke

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Background and Purpose: Clinical methods have incomplete diagnostic value for early diagnosis of acute stroke and large vessel occlusion (LVO). Electroencephalography is rapidly sensitive to brain ischemia. This study examined the diagnostic utility of electroencephalography for acute stroke/transient ischemic attack (TIA) and for LVO. Methods: Patients (n=100) with suspected acute stroke in an emergency department underwent clinical exam then electroencephalography using a dry-electrode system. Four models classified patients, first as acute stroke/TIA or not, then as acute stroke with LVO or not: (1) clinical data, (2) electroencephalography data, (3) clinical+electroencephalography data using logistic regression, and (4) clinical+electroencephalography data using a deep learning neural network. Each model used a training set of 60 randomly selected patients, then was validated in an independent cohort of 40 new patients. Results: Of 100 patients, 63 had a stroke (43 ischemic/7 hemorrhagic) or TIA (13). For classifying patients as stroke/TIA or not, the clinical data model had area under the curve=62.3, whereas clinical+electroencephalography using deep learning neural network model had area under the curve=87.8. Results were comparable for classifying patients as stroke with LVO or not. Conclusions: Adding electroencephalography data to clinical measures improves diagnosis of acute stroke/TIA and of acute stroke with LVO. Rapid acquisition of dry-lead electroencephalography is feasible in the emergency department and merits prehospital evaluation.

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Section: Discussionmentioning

confidence: 99%

Section: Statistical Analysesmentioning

confidence: 99%

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Electroencephalography Might Improve Diagnosis of Acute Stroke and Large Vessel Occlusion

Erani

Zolotova

Vanderschelden

et al. 2020

Stroke

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“…However, this technology has advanced considerably in recent years, allowing research-grade EEG recordings with fully wireless and minimally invasive headsets. Thus, this approach now appears to be ripe for field recordings of psychedelic use [40].…”

Section: Introductionmentioning

confidence: 99%

Neural and subjective effects of inhaled DMT in natural settings

Pallavicini

Cavanna

Zamberlán

et al. 2020

Preprint

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N,N-Dimethyltryptamine (DMT) is a short acting psychedelic tryptamine found naturally in many plants and animals. When combined with a monoamine oxidase inhibitor, such as in the Amazonian brew known as ayahuasca, DMT becomes orally active and its effects are extended. Few studies to date addressed the neural and psychological effects of DMT alone, either administered intravenously or inhaled in freebase form, and none conducted in natural settings. We combined state-of-the-art wireless electroencephalography (EEG) with psychometric questionnaires to study the acute effects of inhaled DMT in 35 participants in natural settings, focusing on questions tuned to the advantages of conducting field research, including the effects of contextual factors (known as set and setting), the possibility of studying a comparatively large number of subjects, and the relaxed mental state of participants consuming DMT in familiar and comfortable settings. We observed that DMT significantly decreased the power of alpha (8-12 Hz) oscillations throughout all scalp locations, while simultaneously increasing power of delta (1-4 Hz) and gamma (30-40 Hz) oscillations. The pharmacokinetics of inhaled DMT was similar to intravenous administration, but we observed a faster return to baseline for power in the alpha band. Gamma power increases correlated with subjective reports indicative of mystical-type experiences. DMT also increased/decreased global synchrony and metastability in the gamma/alpha band, and resulted in widespread increases in signal complexity measured using the Lempel-Ziv algorithm. These results are consistent with previous studies of psychedelic action in the human brain, while at the same time suggesting potential EEG markers of mystical-type experiences in natural settings. In summary, we conducted one of the first field studies on the neural and psychological effects of a serotonergic psychedelic, yielding new insights and advancing our understanding of the translation between laboratory findings and those obtained in the contexts where these compounds are most frequently consumed.

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“…To our knowledge, this is the first EEG-based dual-task walking study in MS. Cognitive-motor paradigms address more precisely patient-reported multitasking deficits and may therefore improve the sensitivity of patient assessments. Importantly, low cost wireless mobile EEG systems of high signal quality are readily available 58 . We believe that EEG-based measurements of cognitive-motor issues may eventually be sensitive enough to be deployed in the clinical setting to track a patient's disease progression and test therapeutic efficacy of interventions.…”

Section: Msmentioning

confidence: 99%

Mobile Brain/Body Imaging of cognitive-motor impairment in multiple sclerosis: deriving EEG-based neuro-markers during a dual-task walking study

Sanctis

Malcolm

Mabie

et al. 2019

Preprint

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Individuals with a diagnosis of multiple sclerosis (MS) often present with deficits in the cognitive as well as the motor domain. The ability to perform tasks that rely on both domains may therefore be particularly impaired. Yet, behavioral studies designed to measure costs associated with performing two tasks at the same time such as dual-task walking have yielded mixed results. Patients may mobilize additional brain resources to sustain good levels of performance. To test this hypothesis, we acquired event-related potentials (ERP) in thirteen individuals with MS and fifteen healthy control (HC) participants performing a Go/NoGo response inhibition task while sitting (i.e., single task) or walking on a treadmill (i.e., dual-task).In previous work, we showed that the nogo-N2 elicited by the cognitive task was reduced when healthy adults are also asked to walk, and that nogo-N2 reduction was accompanied by sustained dual-task performance. We predicted that some MS patients, similar to their healthy peers, may mobilize N2-indexed brain resources and thereby reduce costs. Somewhat to our surprise, the HC group performed the Go/NoGo task more accurately while walking, thus showing a dual-task benefit, whereas, in line with expectation, the MS group showed a trend towards dual-task costs.The expected nogo-N2 reduction during dual-task walking was found in the HC group, but was not present at the group level in the MS group, suggesting that this group did not modulate the nogo-N2 process in response to higher task load. Regression analysis for the pooled sample revealed a robust link between nogo-N2 reduction and better dual-task performance. We conclude that impaired nogo-N2 adaptation reflects a neurophysiological marker of cognitivemotor dysfunction in MS.

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A comparative evaluation of signal quality between a research-grade and a wireless dry-electrode mobile EEG system

Cited by 45 publications

References 53 publications

Electroencephalography Might Improve Diagnosis of Acute Stroke and Large Vessel Occlusion

Electroencephalography Might Improve Diagnosis of Acute Stroke and Large Vessel Occlusion

Neural and subjective effects of inhaled DMT in natural settings

Mobile Brain/Body Imaging of cognitive-motor impairment in multiple sclerosis: deriving EEG-based neuro-markers during a dual-task walking study

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