Multichannel EEG with novel Ti/TiN dry electrodes

Fiedler, Patrique; Griebel, Stefan; Pedrosa, Paulo; Fonseca, C.; Vaz, F.; Zentner, Lena; Zanow, F.; Haueisen, Jens

doi:10.1016/j.sna.2014.10.010

Cited by 54 publications

(35 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the SSVEPs paradigm, the average temporal crosscorrelation between semi-dry/wet electrodes was 0.937 ± 0.027 (n=10) across the nine recording electrode pairs with ten subjects, with the highest at Oz (0.993) and the lowest at C3 (0.904) ( Figure 10B). The correlation results suggest that signals of the semi-dry and wet electrodes pairs were highly similar, and the correlation coefficients of all positions matches or exceeds the reported levels of most existing dry electrodes, ranging from 0.32 to 0.94 [17,25,36,[41][42][43][44][45]. Furthermore, the correlation coefficients of all positions were around 0.9, suggesting that the semi-dry electrodes' performances were robust against factors such as hair thickness.…”

Section: Eeg Signal Evaluationmentioning

confidence: 51%

Novel passive ceramic based semi-dry electrodes for recording electroencephalography signals from the hairy scalp

Zhang

Wang

et al. 2016

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

This study reports on a novel passive ceramic-based semi-dry electrode prototype for electroencephalography (EEG) applications. With the help of capillary forces of the porous ceramics pillars, the semi-dry electrodes build a stable electrode/scalp interface by penetrating hair and releasing a small amount saline in a controlled and sustained manner. The semi-dry electrode/scalp impedances were low and stable (44.4 ± 16.9 kΩ, n=10), and the variation between nine different positions was less 5 kΩ. The semi-dry electrodes have shown non-polarization characteristics and the maximum difference of equilibrium potential between eight electrodes was 579 μV. The semi-dry electrodes demonstrated long-term stability, and the impedance only increased by 20 kΩ within 8 h. EEG signals were simultaneously recorded using a 9-channel gel-based electrode and semi-dry electrode arrays setup on ten subjects. The average temporal cross-correlation between them in the eyes open/closed and the steady state visually evoked potentials (SSVEPs) paradigm were 0.938 ± 0.037 and 0.937 ± 0.027 respectively. Spectral analyses revealed similar response patterns with expected functional responses. Together with the advantages of quick setup, self-application and cleanliness, the result suggests the semi-dry electrode is suitable for emerging real-world EEG applications, such as braincomputer interfaces and wearable EEGs.

show abstract

Section: Eeg Signal Evaluationmentioning

confidence: 51%

Novel passive ceramic based semi-dry electrodes for recording electroencephalography signals from the hairy scalp

Zhang

Wang

et al. 2016

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

show abstract

“…Researchers have tried to change the structure and material to reduce the influence. Fiedler [ 34 ] proposed a bullet-shaped electrode based on Ti/TiN in 2015. They minimized the impact of hair by reducing the contact area, Ti was chosen because of its good mechanical properties and biocompatibility, while a conductive TiN films layer showed high electrochemical stability and stable noise characteristics [ 35 ].…”

Section: Surface Dry Electrodesmentioning

confidence: 99%

Dry Electrodes for Human Bioelectrical Signal Monitoring

Zhao

Dong

et al. 2020

Sensors

130

101

View full text Add to dashboard Cite

Bioelectrical or electrophysiological signals generated by living cells or tissues during daily physiological activities are closely related to the state of the body and organ functions, and therefore are widely used in clinical diagnosis, health monitoring, intelligent control and human-computer interaction. Ag/AgCl electrodes with wet conductive gels are widely used to pick up these bioelectrical signals using electrodes and record them in the form of electroencephalograms, electrocardiograms, electromyography, electrooculograms, etc. However, the inconvenience, instability and infection problems resulting from the use of gel with Ag/AgCl wet electrodes can’t meet the needs of long-term signal acquisition, especially in wearable applications. Hence, focus has shifted toward the study of dry electrodes that can work without gels or adhesives. In this paper, a retrospective overview of the development of dry electrodes used for monitoring bioelectrical signals is provided, including the sensing principles, material selection, device preparation, and measurement performance. In addition, the challenges regarding the limitations of materials, fabrication technologies and wearable performance of dry electrodes are discussed. Finally, the development obstacles and application advantages of different dry electrodes are analyzed to make a comparison and reveal research directions for future studies.

show abstract

“…They can be categorized into two major sub-categories. The first is stiff micro-needles, with a stiff substrate, such as silicon [63], titanium/titanium nitride [68], or brass [69]. They do not generally make a good contact with the skin, and thus need high pressure to achieve acceptable contact between the skin and the electrode.…”

Section: A Low-impedance Dry Electrodesmentioning

confidence: 99%

Impedance and Noise of Passive and Active Dry EEG Electrodes: A Review

2020

View full text Add to dashboard Cite

Dry electrodes are a promising solution for prolonged EEG signal acquisition, whereas wet electrodes may lose their signal quality in the same situation and require skin preparation for setup. Here, we review the impedance and noise of passive and active dry EEG electrodes. In addition, we compare noise and input impedance of the EEG amplifiers. As there are multiple definitions of impedance in each EEG system, they are all first defined. Electrodes must be compatible with amplifiers to accurately record EEG signals. This implies that their impedance plays a significant role in amplifier compatibility and affects total input-referred noise. Therefore, we review the impedance and noise of state-of-the-art amplifiers and electrodes. Furthermore, we compare the various structures and materials used and their final impedance to that of wet electrodes. Finally, we compare state-of-the-art electrodes and amplifiers to the standards of the IFCN and IEC80601-2-26. We investigate bottlenecks and propose a guideline for future work on passive and active dry electrodes, as well as EEG amplifiers.

show abstract

Multichannel EEG with novel Ti/TiN dry electrodes

Cited by 54 publications

References 29 publications

Novel passive ceramic based semi-dry electrodes for recording electroencephalography signals from the hairy scalp

Novel passive ceramic based semi-dry electrodes for recording electroencephalography signals from the hairy scalp

Dry Electrodes for Human Bioelectrical Signal Monitoring

Impedance and Noise of Passive and Active Dry EEG Electrodes: A Review

Contact Info

Product

Resources

About