Table 2.

Neuropsychological functioning of sample

Measure	Mean	SD	Range
MMSE total	28.78	1.318	25–30
DRS total	137.80	3.78	126–144
DRS subtests
Attention	35.91	1.34	31–37
I/P	35.91	1.83	29–37
Construction	5.55	0.89	3–6
Conceptualization	36.50	2.16	31–39
Memory	24.00	1.51	18–25
ARCPT discrimination (d′)	2.43	0.61	0.24–3.66
ARCPT bias (β)	0.63	0.30	−0.13 to 1.0
ARCPT inconsistency	8.71	3.77	3.0–20.0
ARCPT vigilance	0.05	0.05	−0.06 to 0.29
ARCPT final ISI	95.91	62.96	28.1–397.6
ARCPT false-positive errors	2.96	3.89	0.0–25.0
Go/No-go errors	1.04	1.29	0.0–1.0

Note. MMSE = Mini-Mental Status Examination; DRS = Mattis Dementia Rating Scale; I/P = initiation/perseveration (Folstein et al., 1975).