Table 3. Classification accuracies of three tasks for various feature combinations.

	(Window: 0 ~2.5 sec)
Feature combinations	Average classification accuracies (%)
Mean, slope	51.2 ± 17.5
Mean, skewness	54.1 ± 14.5
Mean, kurtosis	53.1 ± 16.1
Mean, delta	57.5 ± 14.9
Slope, skewness	40.8 ± 16.8
Slope, kurtosis	36.6 ± 18.5
Slope, delta	54.1 ± 14.8
Skewness, kurtosis	40.0 ± 16.3
Kurtosis, delta	54.1 ± 9.7
Skewness, delta	54.8 ± 16.6