Table 2.

Pearson's product-moment correlation coefficients for the association between FA values and IHI changes in each tract for young and older adults^a

	Young			Older
	1:1	3:1	1:3	1:1	3:1	1:3
DLPFC-M1
Left to right	−0.16	−0.02	0.02	0.49	0.69a	0.68a
Right to left	0.10	−0.02	0.01	0.63a	0.62a	0.57
PMd-M1
SIHI (8 ms)
Left to right	−0.14	−0.28	0.03	−0.26	0.61a	0.72a
Right to left	−0.04	0.15	−0.11	0.68a	0.71a	0.55
LIHI (40 ms)
Left to right	−0.01	−0.22	−0.20	0.18	0.42	0.59
Right to left	0.01	−0.05	0.11	0.66a	0.75a	0.76a
M1-M1
SIHI (10 ms)
Left to right	0.07	0.09	−0.53	−0.38	0.20	−0.04
Right to left	−0.22	−0.09	0.02	−0.40	0.14	0.31
LIHI (40 ms)
Left to right	−0.33	−0.06	−0.25	−0.27	0.35	0.00
Right to left	−0.30	−0.14	−0.16	−0.32	0.08	0.14

^aSignificant correlation coefficients (DLPFC, critical r = ±0.57, p = 0.017; PMd and M1, r = ±0.61, p = 0.008).