Fig. 3From: Optimized electroencephalogram and functional near-infrared spectroscopy-based mental workload detection method for practical applicationsThe accuracy varies with the number of channels. The figure shows the change curve of accuracy based on SVM under different number of channels. The horizontal axis is the number of channels and the vertical axis is the accuracy. The colored area is the variance of accuracy for different subjects, and the blue line represents the mean of the accuracy. The selection of channels is based on the sorting shown in Fig. 2Back to article page