Spectral Analysis using Nonparametric Techniques to Identify Movements in Encephalographies Signals

Jose de Jesus Moreno Vazquez, Aldo Rafael Sartorius Castellanos, Marcia Lorena Hernandez Nieto, Antonia Zamudio Radilla, Bryan Quino Ortiz

Abstract: The purpose of the following study is to determine patterns generated by 6 movements: Opening / Closing - Eye, Opening / Closing-Mouth, Concentration, Meditation, Eye Movement Up / Down, and Left / Right Eye Movement recorded in the prefrontal area in the pointN_z, applying nonparametric spectral estimation techniques, using the Fast Fourier Transform (FFT), Barlett's Periodogram, and Welch's Periodogram. For this purpose, the measurements were made externally to 30 subjects in the age range of 18 to 22 years, taking as reference 200 sessions per movement applying 10 seconds of test. The sampling frequency in the recording was equal to F_s=512 Hz. The results show sampling frequencies in the range of the Delta 0.5-3.5Hz biosignal applying the FFT method and Bartlett's Periodogram, Welch's Periodogram is not recommended for use by applying a rectangular window greater than 4, generating attenuation in the harmonics.

Keywords: EEG, Nonparametrics methods, Delta Biosignal, Prefrontal surface