Table 4.

The results of interaction and the 2 student's t-test for them.

Connection from Ch no. to Ch no.	Interaction effect			Post-hoc
	F statistics	Sig.	Partial η2	Pair-t-Test (T statistics; Sig.) CH minus CA				Two sample-t-Test (T statistics; Sig.) younger minus older
				Younger group		Older group		Chinese faces		Caucasian faces
2 → 18	7.584	0.0068**	0.0585	−2.267	0.0269*	0.94	0.351	−2.486	0.0143*	1.236	0.2187
4 → 21	7.975	0.0056**	0.0614	−1.949	0.0559	1.865	0.067	−1.862	0.065	1.828	0.07
10 → 19	9.836	0.0021**	0.0746	−2.247	0.0283*	1.552	0.1257	−2.443	0.0160*	1.517	0.1318
25 → 3	8.223	0.0049**	0.0632	−1.987	0.0514	2.821	0.0064**	−2.183	0.0310*	2.42	0.0170*
25 → 19	10.572	0.0015**	0.0798	−1.485	0.1428	1.737	0.0875	−2.382	0.0188*	0.452	0.6517
31 → 3	12.15	0.0006***	0.0906	1.163	0.2495	−2.78	0.0072**	1.633	0.105	−2.575	0.0112*
39 → 5	10.231	0.0018**	0.0774	0.01	0.9921	3.353	0.0014**	−3.045	0.0029**	0.499	0.6185
40 → 43	7.216	0.0082**	0.0558	2.082	0.0416*	−1.24	0.2199	1.782	0.0773	−1.461	0.1466
36 → 5	8.553	0.0041**	0.0655	−0.102	0.9194	3.052	0.0034**	−1.862	0.065	1.258	0.2109

The 2 student's t-test based on two divided groups, namely younger and older group. One was the Pair-T-test for younger group and older group, respectively, between own-race faces and other-race faces. The other was the Two-sample T-test for own-race and other-race, respectively, between younger group and older group.

^*Sig. < 0.05;

^**Sig. < 0.01;

^***Sig. < 0.001.