Channel and Feature Selection for a Motor Imagery-Based BCI System Using Multilevel Particle Swarm Optimization

Table 3

Classification results with different levels of PSO for channel selection.

Level	SC	ACC (%)	TRT (s)	TET (s)	Kappa	F-score	SEN	SPE	PRE
1	26	95	7,258	1.215	0.90	95.14	98	92	92.45
2	14	97	9,862	0.986	0.94	97.03	98	96	96.08
3	12	97	11,109	0.854	0.94	97.03	98	96	96.08
4	11	97	13,270	0.791	0.94	97.03	98	96	96.08
5	11	97	15,248	0.791	0.94	97.03	98	96	96.08

SC: selected channels; ACC: accuracy; TRT: training time; TET: test time; SEN: sensitivity; SPE: specificity; PRE: precision.