Optimal Fractal Feature and Neural Network: EEG Based BCI Applications
Montri Phothisonothai, Katsumi Watanabe · InTech eBooks · 2013
Experimental paradigm 1In this study, we tested 7-male and 3-female.Their ages were 21-32 years (mean age, 25.3 years; SD ±3.6), with 180 trials per subject (30 trails per task).At the beginning of each EEG recording session, the subjects were instructed to relax with their eyes open for 30 s.The EEG data from this period was used as the baseline for the tasks.The duration of one trial was 6 s throughout the experiment.Each trail in the experiment was divided into two periods, a relaxing period of 0-3 s and an imaging period of 3-6 s.When the subjects had their eyes open on a blank screen, they would be in a relaxed state of mind (relaxing period).In the imaging period, the subjects imagined with eyes open, as represented by arrows.This study focuses on the motor movement functions in the brain.Therefore, imagination of motors movements are used as the tasks throughout this experiment.To assist the subject imagine the task without difficulty, we provide the acting stimuli in accordance to the given tasks.Explicit indicators are also shown on a monitor for informing subject during the experiment, all selected tasks are listed in Table 1.