Spectral EEG Features of a Short Psycho-physiological Relaxation

Abstract

Short-lasting psycho-physiological relaxation was investigated through an analysis of its bipolar electroencephalographic (EEG) characteristics. In 8 subjects, 6-channel EEG data of 3-minute duration were recorded during 88 relaxation sessions. Time course of spectral EEG features was examined. Alpha powers were decreasing during resting conditions of 3-minute sessions in lying position with eyes closed. This was followed by a decrease of total power in centro-parietal cortex regions and an increase of beta power in fronto-central areas. Represented by EEG coherences the interhemispheric communication between the parieto-occipital regions was enhanced within a frequency range of 2-10 Hz. In order to discern between higher and lower levels of relaxation distinguished according to self-rated satisfaction, EEG features were assessed and discriminating parameters were identified. Successful relaxation was determined mainly by the presence of decreased delta-1 power across the cortex. Potential applications for these findings include the clinical, pharmacological, and stress management fields.

Characterization of EEG patterns in brain-injured subjects and controls after a Snoezelen® intervention

“…Nevertheless, other results (e.g. a reduction in delta power and an increase of EEG complexity) contradict our findings [42,43]. Our study revealed that Snoezelen ® intervention modifies EEG activity, leading to a slowing of the EEG activity and a reduction of irregularity/complexity values.…”

Classification of Artefacts in EEG Signal Recordings and EOG Artefact Removal using EOG Subtraction

“…The distances between nasion and anion is measured and the distance between the two ears is measured, and electrodes are placed at 10% and 20% distance as shown in fig.1, hence the name 10-20system [5].Electrode placements are labelled according to brain areas: F -frontal, C -central, T -temporal, P -posterior, and O -occipital. The electrical characteristic of EEG is its amplitude range in µV and frequency band in 0.5Hz to 60Hz [1] …”

“…In 1958, International Federation in Electroencephalography and Clinical Neurophysiology adopted calibration for electrode location called 10-20 electrode placement system [5] [14]. This system standardized the physical placement of electrodes and the labels of electrodes on the scalp.…”

A comparative study on feature extraction and classification of mind waves for brain computerinterface (BCI)

“…The data acquisition of the human mind waves (EEGs) are collected from the electrodes [1] situated directly on the grey matter or upon the scalp which are called as Invasive and Non-invasive methods and that electrical activity between neurons known as voltage magnitude is plotted versus time. The electrical activity of the EEG signal is nothing but the amplitude of EEG signal.…”