#Electrode eeg trial#

The conclusion is that dry electrodes can record EEG data in comparable quality to wet electrodes when in a stationary setting. The results show that both systems performed well, with the wet system having a slight advantage in data quality.

#Electrode eeg trial#

We wonвЂ™t dive into the methodology too much, but, in a nutshell, the study compared the signals recorded on 27 individuals with wet and dry electrodes and looked at spectral power in low frequency bands, event-related potential components (P3b), and a single trial classification, based on an machine-learning approach. The relevant question becomes: Is the data quality of dry electrodes still good enough to deliver reliable results? Are they a valid alternative to wet electrodes? To answer this question, Julia Kam, a Psychology Professor at the University of Calgary, has conducted this study: Systematic comparison between a wireless EEG system with dry electrodes and a wired EEG system with wet electrodes.

In summary, dry electrodes are trading increased convenience for signal stability and quality.

Without the use of a conductive substance, EEG signals can be more noisy, and without the additional adhesion provided by the gel, more prone to motion artifacts. Dry electrodes, however, do not require conductive gel and are set up much faster. Especially in studies that require high spatial resolution, with up to 128 or 256 electrodes, just setting up the experiment can take multiple hours per test subject. Applying gel can be time consuming and may leave residue in the test subjectвЂ™s hair. Conventional EEG has been recorded with вЂњwetвЂќ electrodes that use a layer of conductive gel or paste to increase conductivity between the electrodes and the test subjectвЂ™s skin. One important factor in the search for mobility was the arrival of dry electrodes. These new possibilities resulted in an increasing demand for solutions that further increase the mobility and flexibility of such systems. This new type of equipment now allows researchers to get a glimpse at the subjectвЂ™s brain activity in completely new environments: test subjects can move around within a lab and furthermore, anything outside of a conventional lab setting has become available as a feasible research setting at an instant. Over the past few years however, we have witnessed the arrival and maturing of mobile EEG devices that match todayвЂ™s consumer electronics in portability, size and weight. Until a few years ago, EEG research was restricted to labs or clinics due to the characteristics of the equipment: It was bulky and stationary which required the test subject to be stationary as well. by looking at spatial and temporal parameters, and allow for localization of the sources within specific parts of the brain.ДЄrrival of mobile EEG driving demand for dry electrodes These signals are analyzed in a number of ways, e.g. By attaching electrodes to the scalp, researchers and medical professionals are able to measure the small electrical potentials that arise on the surface of the scalp and represent the brainвЂ™s own neuronal activity. EEG is a widely used research technique that continues to increase our understanding of the human brain.