Table 2.

Means and standard deviations of PLIs and ERSPs at 40 Hz and at IGFs.

		40-Hz EFR	IGF-EFR	t-Test	IGF
PLI	Mean	7.07	7.63	−6.534, p < 0.001	41.89
	SD	2.39	2.20		2.27
ERSP	Mean	1.29	1.35	−6.849, p < 0.001	42.19
	SD	0.20	0.20		2.57

EFR—envelope following response; IGF—individual gamma frequency; IGF-EFR—envelope following response at individual gamma frequency.