IBI	Inter-Beat Interval
PPG	Photoplethysomogram
CNN	Convolution Neural Network
ECG	Electrocardiogram
EEG	Electroencephalography
GSR	Galvanic Skin Response
EDA	Electrodermal Activity
ANS	Autonomic Nervous System
HRV	Heart Rate Variability
DL	Deep Learning
ML	Machine learning
DNN	Deep Neural Network
DOA	Depth Of Anesthesia
FCNN	Fourier Convolution Neural Network
DFT	Discrete Fourier transform
FFT	Fast Fourier transformation
RMSSD	Root Mean Squared Difference of Adjacent IBIs
SDNN	Standard Deviation of IBIs