At pretest, the relative power of a wave ranged from 0.13
(SD ¼ 0.05) to 0.20 (SD ¼ 0.09) for the experimental group, and
from 0.17 (SD ¼ 0.08) to 0.26 (SD ¼ 0.09) for the control group
without significant group differences. The distribution of a wave
was balanced between the left and right sides for both groups. The
EEG patterns were similarly distributed between the groups. The
mean scores of cognitive function as measured by MMSE were
24.86 (SD ¼ 4.14) for the experimental group, and 23.88 (SD ¼ 3.74)
for the control group. Both groups were similarly assessed as the
borderline for schizophrenia cutoff points of 23/24