Análisis no-lineal de la onda gamma del EEG en una prueba de atención e inhibición.

Introduction: In recent decades, the EEG signal has been studied from a non-linear mathematical perspective, allowing the understanding of cerebral electrical activity as a complex dynamic system. Objective: analyze the Hurst exponents and correlations of such exponents in the gamma wave during the resolution of an alternating attention and interference inhibition task in university students. Methods: The sample consisted of 14 male students of physical education. The brain-interface device Emotiv Epoc® was used to evaluate the electrical activity of the brain, the symbols and digits test was applied to evaluate the alternating attention, and the Stroop words and colors test were used to inhibit interference Results: Of the seven subjects who solved the alternating attention test, one presented a greater tendency to chaos in the left hemisphere, four revealed a greater tendency to chaos in the right hemisphere and two did not present a definite tendency. Of the seven subjects who solved the interference inhibition test, five presented variations in the mean H between the three Stroop plates, especially in the temporal region. The mean of the H exponents in both tests was less than 0,5. Conclusions: During the attention test, a greater chaos of brain electrical activity is observed, without correlations between the regions studied. During the inhibition test, H modifications do not present definite patterns towards order or chaos. [ABSTRACT FROM AUTHOR]