Temporal scaling and inter-individual hemispheric asymmetry of chaos estimation from EEG time series

The aim of the present research was to measure the brain order/chaos inter-hemispheric asymmetry, long memory processing, and predictability of an EEG signal at different timescales during a simple exercise of closed eyes imagination or mental projection. We studied inter-hemispheric asymmetries in frontal, temporal and occipital areas of the brain during 2 minutes of silent and relaxed mental projective task of visualizing themselves performing a physical exercise practice. EEG signal was recorded using the brain-computer device EmotivEpoc® from 8 subjects aged between 20 and 30 years, all fellowships in two weeks of modern dance workshop. The results showed that Hurst (H) exponent used as anestimator of the persistence/anti-persistence dynamics of the EEG process vary inversely with the length of the time window (1, 3, 12, 30 and 120 s) used to calculate H at different timescales.We foundsignificant inter-hemispheric asymmetry in the temporal and occipital regions, with left hemisphere having the higher scores of H. Together with a common general trend we observed inter-individual variability of inter-hemispheric asymmetry between frontal, temporal and occipital lobes, being the temporal the one with the highest scores. We evaluated statistically these differences and significance.