Figure 5From: Evaluation of mental stress by physiological indices derived from finger plethysmographyChanges in finger pulse characteristics. (A) Representative changes in finger pulse waveform. (B) Representative changes in chaotic attractor. Chaotic attractor was reconstructed by embedding nonlinear data of FPG into the dimensional phase. Differences in depth of the attractor are shown in color. AU, arbitrary unit; CWT, Color-word conflict test.Back to article page