Scalp electrode impedance, infection risk, and EEG data quality

Ferrée, Thomas C.; Luu, Phan; Russell, Gerald S.; Tucker, Don M.

doi:10.1016/s1388-2457(00)00533-2

Cited by 872 publications

(591 citation statements)

References 13 publications

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“…Data was recorded with a sampling frequency of 500 Hz with the average reference as recording reference. Subject ground was at the AFz position and impedances were kept bellow 20 kX [Ferree et al, 2001].…”

Section: Eeg Acquisitionmentioning

confidence: 99%

Differences in cortical coding of heat evoked pain beyond the perceived intensity: An fMRI and EEG study

Haefeli

Freund

Kramer

et al. 2013

Human Brain Mapping

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Imaging studies have identified a wide network of brain areas activated by nociceptive stimuli and revealed differences in somatotopic representation of highly distinct stimulation sites (foot vs. hand) in the primary (S1) and secondary (S2) somatosensory cortices. Somatotopic organization between adjacent dermatomes and differences in cortical coding of similarly perceived nociceptive stimulation are less well studied. Here, cortical processing following contact heat nociceptive stimulation of cervical (C4, C6, and C8) and trunk (T10) dermatomes were recorded in 20 healthy subjects using functional magnetic resonance imaging (fMRI) and electroencephalography (EEG). Stimulation of T10 compared with the C6 and C8 revealed significant higher response intensity in the left S1 (contralateral) and the right S2 (ipsilateral) even when the perceived pain was equal between stimulation sites. Accordingly, contact heat evoked potentials following stimulation of T10 showed significantly higher N2P2 amplitudes compared to C6 and C8. Adjacent dermatomes did not reveal a distinct somatotopical representation. Within the assessed cervical and trunk dermatomes, nociceptive cortical processing to heat differs significantly in magnitude even when controlling for pain perception. This study provides evidence that controlling for pain perception is not sufficient to compare directly the magnitude of cortical processing [blood oxygen level dependence (BOLD) response and amplitude of evoked potentials] between body sites. Hum Brain Mapp 35:1379-1389,

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Section: Eeg Acquisitionmentioning

confidence: 99%

Differences in cortical coding of heat evoked pain beyond the perceived intensity: An fMRI and EEG study

Haefeli

Freund

Kramer

et al. 2013

Human Brain Mapping

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“…However, the increase of the net output resistance of the cap/safety circuit is small, since there is already a current limiting resistor (16 kilo-ohms) for reducing the currents caused by the dynamic magnetic field. Moreover, the input resistance of the preamplifier is relatively high (3.3 mega-ohms), warranting the use of electrodes with this level of resistivity (Ferree et al, 2001). Table I shows that the Ag/AgCl electrodes caused the largest susceptibility artifact, the Ag/ AgCl coated nonmetallic electrodes caused an intermediate amount of susceptibility artifact, and the carbon wire electrodes caused the least amount of susceptibility artifact.…”

Section: Electrode Impedancementioning

confidence: 99%

An EEG (electroencephalogram) recording system with carbon wire electrodes for simultaneous EEG-fMRI (functional magnetic resonance imaging) recording

Negishi

Abildgaard

Laufer

et al. 2008

Journal of Neuroscience Methods

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Simultaneous EEG-fMRI (Electroencephalography-functional Magnetic Resonance Imaging) recording provides a means for acquiring high temporal resolution electrophysiological data and high spatial resolution metabolic data of the brain in the same experimental runs. Carbon wire electrodes (not metallic EEG electrodes with carbon wire leads) are suitable for simultaneous EEG-fMRI recording, because they cause less RF (radio-frequency) heating and susceptibility artifacts than metallic electrodes. These characteristics are especially desirable for recording the EEG in high field MRI scanners. Carbon wire electrodes are also comfortable to wear during long recording sessions. However, carbon electrodes have high electrode-electrolyte potentials compared to widely used Ag/ AgCl (silver/silver-chloride) electrodes, which may cause slow voltage drifts. This paper introduces a prototype EEG recording system with carbon wire electrodes and a circuit that suppresses the slow voltage drift. The system was tested for the voltage drift, RF heating, susceptibility artifact, and impedance, and was also evaluated in a simultaneous ERP (event-related potential)-fMRI experiment.

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“…A 128-channel Geodesic Sensor Net (Electrical Geodesics, Eugene, OR) recorded the EEG data. All impedances were kept below 40K⍀ [Ferree et al, 2001]. A vertex reference was used in the recording and the data were recomputed off-line against the average reference.…”

Section: Eeg Recording and Averagingmentioning

confidence: 99%

The time course of brain activity in reading English and Chinese: An ERP study of Chinese bilinguals

Liu

Perfetti

2003

Human Brain Mapping

160

105

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Abstract:Chinese bilinguals performed a delayed naming task, reading both Chinese characters and English words, while EEGs were recorded by a 128-channel system. Principle component analysis (PCA) of Event Related Potentials (ERP) from the onset of the stimulus suggested a temporal unfolding of graphic, phonological, and semantic processing that depended on both language and word frequency. At 150 msec, Chinese produced an earlier and higher amplitude shift (N150) than English. At 250 msec, frequency effects were significant for both Chinese and English, but at 450 msec, only the English frequency effect was reliable. Source localization analysis by Low Resolution Electromagnetic Tomography (LORETA) showed bilateral occipital (left BA 17, right BA 18) visual processing of Chinese characters with left occipital only (left BA 17) for English high-frequency words. Low-frequency English words showed activation bilaterally, but with a more diffused and extended temporal pattern. Right prefrontal area (BA 10) was found to be strongly activated in the mid latency (300 -400 msec) period of Chinese character naming, whereas English word naming showed more medial frontal (BA 8, and 10) activation. A post 450-msec visual verification was found to be general for both writing systems. Hum. Brain Mapping 18:167-175, 2003.

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Scalp electrode impedance, infection risk, and EEG data quality

Cited by 872 publications

References 13 publications

Differences in cortical coding of heat evoked pain beyond the perceived intensity: An fMRI and EEG study

Differences in cortical coding of heat evoked pain beyond the perceived intensity: An fMRI and EEG study

An EEG (electroencephalogram) recording system with carbon wire electrodes for simultaneous EEG-fMRI (functional magnetic resonance imaging) recording

The time course of brain activity in reading English and Chinese: An ERP study of Chinese bilinguals

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