Table 1.

HRV, ECG, and GSR features.

HRV Features		ECG Features	GSR Features
Features	Meaning	Features	Features
meanNN	The mean of normal-to-normal (NN) intervals	P mean & std R mean & std T mean & std QR mean & std RS mean & std	Rise Time mean & std Amplitude mean & std Apex mean & std Decay Time mean & std Width mean & std
SDNN	The standard deviation of the NN intervals
RMSSD	The root mean square of the RR intervals
LF	Power in the low-frequency range (0.04–0.15 Hz)
HF	Power in the high-frequency range (0.15–0.40 Hz)
LF/HF	The ratio of LF to HF