The electrodes PD 0332991 were padded in order to ensure a smooth surface and a soft pressure. They were inhibitor connected using cables with crocodile clips and snap buttons. Standard high-quality sintered eight mm EEG electrodes were placed within five mm of the textile electrodes using the same standard electrode gel. Standard electrodes were also used for reference and ground and placed at the vertex and on the forehead, respectively. The setup can be seen in Figure 3.Figure 2.(a) Standard electrode. (b) Textile electrode Type I. (c) Textile electrode Type II.Figure 3.Experimental setup. The white leads are connected to standard electrodes; the black ones are connected to textile electrodes.2.2.

EEG RecordingThe signals were digitized at a sampling frequency of 1,000 Hz using a DC-coupled EEG amplifier (NeuroS4U, Medical Computer Systems, Moscow, Russia) and a laptop running the SACS? signal acquisition Inhibitors,Modulators,Libraries and archiving system [11]. After recording, the signals were exported to Inhibitors,Modulators,Libraries Matlab where DC offset was removed by detrending, i.e., subtracting a fitted straight line from the data. For the time domain plots and the correlation computations, Inhibitors,Modulators,Libraries power line interference was reduced using a comb filter that removed 50 Hz and its overtones and the signals were band-pass filtered from 1.5 to 70 Hz.EEG traces were recorded from five subjectively healthy adult volunteers. The subjects were awake, sitting comfortably, with closed eyes. Under these circumstances the alpha rhythm (7.

5�C13 Hz) is readily identified over the posterior parts of the head. Data was recorded using standard electrodes and two different types of textrodes (cf.

above) and each type was Inhibitors,Modulators,Libraries Inhibitors,Modulators,Libraries tested using both saline solution and electrode gel as contact medium. The recording length for each category ranged from 2.7 min to 7.4 min. Ethical approval (nr 274-11) was obtained from the regional ethical review board in Gothenburg. All test subjects gave informed consent to participate in Inhibitors,Modulators,Libraries the study.2.3. Performance ComparisonThe signals from the standard and textile electrodes were initially compared using visual inspection of the data in the time and frequency domains. An Inhibitors,Modulators,Libraries Inhibitors,Modulators,Libraries experienced electroencephalographer (MT) deemed the acquired signals to be of cerebral origin and of good enough quality to justify further comparisons.

Brefeldin_A Thereafter, the Dacomitinib power spectra (0�C45 Hz) were estimated using the Welch method.

The Welch method was applied sellectchem using eight modified periodograms with a Hamming window and 50% overlap [12] and based on data epochs of 10 s. No filtering except detrending was applied on the data before spectrum estimation.The level of similarity between the signals in the time domain using the textile and standard electrodes was estimated by calculating the Pearson product-moment merely correlation coefficient (corrcoef in Matlab). All data, except for parts containing very large motion artifacts, was divided into epochs of ten seconds each.