PPG	Photoplethysmography
PAC	Phase–amplitude coupling
MI	Modulation index
DPPG	Differential photoplethysmography
MAX MI	Maximum modulation index values
Moran’s I	Moran index
HRV	Heart rate variability
CDF	Cumulative distribution function
SVM	Support Vector Machine
KNN	K-Nearest Neighbor
CNN	Convolutional Neural Network
EER	Equal error rate
SNA	Sympathetic nerve activity
RRI	R-R interval
LF	Low-frequency