Table 1 . Paired samples statistics for frequency domain features .

Name		Mean	Number	SD	P
HFnorm*	HFnormb_i	0.84	6	0.133	0.457
	HFnorma_i	0.88	6	0.105
LFnorm**	LFnormb_i	0.16	6	0.133	0.475
	LFnorma_i	0.12	6	0.105
LFnorm/HFnorm	LFnormb_i/ HFnormb_i	0.23	6	0.261	0.484
	LFnorma_i/ HFnorma_i	0.15	6	0.151

*High-frequency; ** Low-frequency.

Norm is pointed to normal time.

The “after” and “before injection” words are indicated by a_i and b_i indexes, respectively.