Abbreviation	Description
EEG	Electroencephalography
SODP	Second-order differential plot
GA	Genetic algorithm
PSO	Particle swarm optimization
AsyLnCPSO	PSO with asynchronous learning factor
STD	Standard descriptor
SAV	Sum of the angles between consecutive vectors
SSHD	Sum of the shortest distance of each point from the 45-degree line
STA	Sum of the triangle area using consecutive vectors
CTM	Central tendency measure
SDC	Sum of distances to coordinate
SSVL	Sum of successive vectors length
SCC	Sum of the centroid-to-centroid distance of successive triangles