G. Pfurtscheller et al., DIFFERENTIATION BETWEEN FINGER, TOE AND TONGUE MOVEMENT IN MAN BASED ON 40 HZ EEG, Electroencephalography and clinical neurophysiology, 90(6), 1994, pp. 456-460
Movements of right and left index fingers, right toe and tongue were s
tudied by EEG measurement in the alpha and gamma (30-40 Hz) bands. The
EEG was recorded with a 56-electrode array over pre- and postcentral
areas. For each movement the average power decrease, as a measurement
of the event-related desynchronization or power increase in narrow fre
quency bands, was calculated. Single-trial data from 8 electrodes, 3 f
requency bands and 4 time points within a 1 sec window were subject to
a classification task. It was found that, based on single EEG trials,
the data from the 4 movements could be differentiated with an accurac
y of 70% when alpha and gamma band activity were used but only with 58
% in the case of the alpha band activity alone. This shows that the ga
mma band activity or 40 Pit EEG is strongly related to planning of a s
pecific movement and therefore, improves the accuracy of classificatio
n significantly.