Table 1.

Correlations between n-back performance (differences scores in response times and accuracy between 0-back and 2-back conditions) and performance measures of the different psychometric tests.

Age group	Young (N = 141)		Middle (N = 116)		Old (N = 163)
Measure	RT	Acc	RT	Acc	RT	Acc
Psychometric task
Digit Span Task (forward)	-0.093	-0.160	-0.054	-0.356∗∗	0.003	-0.153
Digit Span Task (backward)	-0.136	-0.201	-0.143	-0.442∗∗	-0.117	-0.157
Word Fluency Test	-0.076	-0.116	-0.013	-0.162	-0.179	-0.234∗
Digit Symbol Test	-0.251∗	-0.205	-0.235	-0.267∗	-0.211∗	-0.302∗∗
d2 Test (correct)	-0.205	-0.225∗	-0.067	-0.185	-0.154	-0.265∗∗
VLMT (Σ1-5)	-0.089	-0.100	-0.229	-0.160	0.082	-0.273∗
VLMT (recognition)	-0.073	0.014	-0.151	-0.187	0.047	-0.225∗
Stroop Task (part 1)	0.162	0.221∗	0.029	0.329∗∗	0.024	0.056
Stroop Task (part 2)	0.197	0.237∗	-0.073	0.308∗∗	0.149	0.141
Stroop Task (part 3)	0.210	0.286∗∗	0.148	0.234∗	0.186	0.106
Trial Making Test (A)	0.261∗	0.236∗	-0.027	0.227	0.179	0.310∗∗
Trial Making Test (B)	0.338∗∗	0.244∗	-0.051	0.390∗∗	0.126	0.278∗∗

^∗ Indicates correlations significant on an adjusted alpha level of p < 0.005 and bold ink indicates p < 0.001.