Recognition of the Impulse of Love at First Sight Based on Electrocardiograph Signal

Table 1

ECG characteristic description.

Number	Symbol	Feature description
Time-domain features
1	Mean_RR	Mean of RR intervals
2	CVRR	The coefficient of variance of RR intervals
3	SDRR	Standard deviation of RR intervals
4	RMSSD	Root mean square of successive differences of RR intervals
5	MSD	Mean of the absolute values of the first differences of RR intervals
6	SDSD	Standard deviation of successive differences of RR intervals
7	NN50	Number of interval differences of successive RR intervals greater than 50 ms
8	PNN50	Corresponding percentage of RR50
9	NN20	Number of interval differences of successive RR intervals greater than 20 ms
10	PNN20	Corresponding percentage of RR20
11	Mean_HR	Average heart rate
12	QD	Quartile deviation of RR intervals
Nonlinear features
13	SD1	Standard deviation for T direction in Poincare plot
14	SD2	Standard deviation for L direction in Poincare plot
15	SD1_SD2	SD1/SD2
16	CSI	Cardiac sympathetic index
17	CVI	Cardiac vagal index
18	modified_CSI	Modified CSI
19	LZC	LZ complexity
Frequency-features
20	TP	Power of range 0.04–0.4 Hz of the PSD of RR intervals
21	LF	Power of range 0.04–0.15 Hz of the PSD of RR intervals
22	HF	Power of range 0.15–0.4 Hz of the PSD of RR intervals
23	LF/HF	Proportion of LF to HF
24	nLFP	Proportion of LF to LF + HF
25	nHFP	Proportion of HF to LF + HF