Table 8.

User survey results of the BCI.

Factors	L 0	R 0.33	A 0.66	H 1.00	Average (%)
Symbol consistency			0.80	0.20	72.80
Correctly rendered text and graphics			0.20	0.80	93.20
Simple and aesthetic design		0.20	0.20	0.60	79.80
Easy-to-learn interface management			0.60	0.40	79.60
Comfort of color, frequency, and time of stimulation		0.20	0.40	0.40	73.00
It is intuitive to recover an action after making a mistake				1.00	100.00
Average					83.07

Note. L low, R regular, A acceptable, and H high.