[A semiconductor photostimulator for electroencephalography with USB control].

The paper contains a description of electroencephalography (EEG) photostimulator for examining the induced cerebral potentials. The device was designed to function within the EEG computer complexes; a high-intensity irradiation LED matrix is used as the light source. The 1.

[Sleep EEG as a nonlinear dynamic process: a comparison of global correlation dimension of human EEG and measures of linear interdependence between channels].

The goal of this work was to study (1) whether the estimation of correlation dimension (D2) using spatial embedding distinguishes between sleep stages and (2) whether information gained from the application of global D2 is redundant to measures of linear interdependence between channels. Twenty one-channel EEG segments of 12 healthy male subjects recorded during waking and sleep stages REM, I, II, and III-IV (according to the Rechtshaffen and Kales criteria) were analyzed with global (multichannel) D2, mean square correlation coefficients (MS) and proportion of variance accounted for by the first principal component (PC1). D2 was found to decrease progressively from stage I to stage III-IV with D2 values of waking and REM being close to those of stages I and II.

[A method of minimization of ECG artifacts in digital EEG].

An off-line algorithm of automatic detection and minimization of ECG artifacts in digital EEG without using the ECG channel is proposed. A possibility of application of this technique for processing another high-frequency artifacts and different waveforms in biosignals is discussed.