TABLE 1.

Participants’ demographic information.

	Group	Number	Range	Mean	SD
Age∗	Young	220	18–45	30.25	5.82
	Old	192	66–88	75.29	6.17
Cattell∗	Young	213	22–44	36.59	4.35
	Old	188	11–39	26.08	6.04
M-RT∗	Young	215	0.27–0.39	0.31	0.05
	Old	140	0.29–0.48	0.34	0.07
SD-RT∗	Young	215	0.07–0.17	0.12	0.02
	Old	140	0.01–0.30	0.08	0.04

^∗indicates a significant difference between groups using two-sample t-test, p < 0.001.