ABSTRACT
The aim of this study was to analyze the wide frequency range of EEG-parameters to estimate a possible functional importance of different EEG-components to reach the relaxation state. Sixty five subjects 17 to 20 years old were involved in the investigation. The relaxation session with monopolar EEG-registration and autonomic parameters recording was conducted to each subject. Significant changes in all analyzed EEG-bands were observed during relaxation. Two types of changes of EEG-coherence were distinguished by wakefulness-relaxation shift of state, and correlation of the type of dynamic with LF/HF ratio were discovered.
Subject(s)
Autonomic Nervous System/physiology , Electroencephalography , Heart Rate/physiology , Relaxation/physiology , Adult , HumansABSTRACT
A group of adults participated in experiment in which they were asked to reach relaxed state by using relaxation techniques (active relaxation) and to maintain this state without any technique (passive relaxation). Some changes of EEG-characteristics during relaxation were analyzed. This experiment includes four situations (different functional states): baselinel, active relaxation, passive relaxation, baseline2. EEG was recorded from 10 cortical leads: O1, O2, TPO (left and right), P3, P4, C3, C4, F3 and F4. A comparative EEG analysis was done for 10 frequency bands from 5 to 40 Hz. In each experimental situation we revealed general trends for EEG parameters and also some specific changes in EEG, which characterized brain organization during passive and active relaxed states.
Subject(s)
Brain Waves/physiology , Brain/physiology , Relaxation Therapy , Relaxation/physiology , Adolescent , Adult , Female , Humans , MaleABSTRACT
The aim of the study was to assess an impact of biofeedback training (5 sessions) onto the voluntary regulation of the brain functional state (relaxation) in two groups of children of 7-8 and 9-10 years old. EEG alpha-band spectral coherence and skin resistance were measured during pre-relaxation, relaxation and post-relaxation phases before and after training. Short-term memory test was used to evaluate behavioral changes in functional state regulation before and after training. The group of children of 9-10 y.o. was the only group that showed any significant relaxation-related changes of spectral coherence in alpha-band after training. Besides, that group showed a significant post-relaxation improvement in short-term memory volume. We found a number of individual psychophysiological indices that influenced an efficiency of the biofeedback training.
