Table 3.

Proportion of responses, Accuracy (A′), and response Bias (B″D) of SCZ patients and HC.

Variable	Patients Mean (SD)	Controls Mean (SD)	p-Value
P (lure-yes)	0.49 (0.2)	0.48 (0.1)	0.694
(Old-yes)	0.57 (0.2)	0.69 (0.1)	0.020
(New-no)	0.76 (0.2)	0.86 (0.1)	0.098
A′ old/lure	0.56 (0.1)	0.67 (0.1)	0.022
B″ old/lure	−0.08 (0.6)	−0.30 (0.3)	0.098

Notes: Data are presented as mean (SD). Significant p-values are shown in italics.

A′ provides an estimation of the subjects ability to discriminate between old words and lures. This index is measure of discrimination between healthy controls and patients (adapted from Curran et al., 2001; Gallo, 2006). The formula of the A′ is: = 0.5 + (([old-yes - lure-yes]×[1 + old-yes - lure-yes])/([4×old-yes]×[1 - lure-yes])).

The B″D value reflects the liberal or conservative bias about old/lure discrimination (Donaldson, 1992; Curran et al., 2001). It is obtained by the formula: (([1 - old-yes]× [1 - lure-yes])-[old-yes×lure-yes])/(([1 - old-yes]× [1 - lure-yes] + [old-yes×lure-yes])).