Fig. 3

Evaluation of EEG rhythm variations by calculating the variation score, where the occupancy rates during photo-image stimulations were subtracted from occupancy rates during music stimulations. The variation scores obtained from normal controls (n = 10) and dementia patients (n = 16) were averaged and are plotted (mean ± SD). Circles indicate data from normal controls, and squares indicate data from dementia patients. Note that variation scores distant from zero indicate that there is a large difference between the two occupancy rates