Computational Intelligence and Neuroscience

Research Article

Classification of BCI Users Based on Cognition

Table 5

Clustering results.


Tasks	Physiological indicators	Min.	Max.	Avg.	Std. dev.	Cluster center (0)	Cluster center (1)

P 300/1	P 300/1 pupil dilation (%)	−3.72	36.93	11.364	8.75	20.84	5.76
	P 300/1 blink rate per second	0.02	0.3	0.064	0.052	0.08	0.06
	P 300/1 normalized GSR	0.001	0.02	0.005	0.003	47 × 10⁻⁴	46 × 10⁻⁴

P 300/2	P 300/2 pupil dilation (%)		51.95	23.68	12.604	32.36	11.41
	P 300/2 blink rate per second	0.04	0.407	0.076	0.07	0.07	0.09
	P 300/2 normalized GSR	0.003	0.062	0.006	0.008	58 × 10⁻⁴	71 × 10⁻⁴

SSVEP/1	SSVEP/1 pupil dilation (%)		50.68		12.069		32.99
	SSVEP/1 blink rate per second	0.02	0.257	0.056	0.062	0.05	0.15
	SSVEP/1 normalized GSR	0.0003	0.024	0.004	0.003	4 × 10⁻³	85 × 10⁻⁴

SSVEP/2	SSVEP/2 pupil dilation (%)		28.37				5.59
	SSVEP/2 blink rate per second	0.017	0.224	0.046	0.04	0.04	0.07
	SSVEP/2 normalized GSR	0.0004	0.022	0.004	0.002	44 × 10⁻⁴	42 × 10⁻⁴

MI/1	MI/1 pupil dilation (%)		22.16			−7.35	7.76
	MI/1 blink rate per second	0.02	0.48	0.061	0.104	0.04	0.1
	MI/1 normalized GSR	0.001	0.01	0.004	0.002	39 × 10⁻⁴	41 × 10⁻⁴

MI/2	MI/2 pupil dilation (%)		40.63	2.947	9.589	14.82	−1.48
	MI/2 blink rate per second	0.02	0.35	0.053	0.067	0.07	0.05
	MI/2 normalized GSR	0.001	0.021	0.004	0.002	48 × 10⁻⁴	4 × 10⁻³