Introduction. The Prefrontal Symptoms Inventory (PSI) is a self-reported questionnaire, created in Spain, which asks about cognitive, emotional and behavioural alterations in activities of daily living and which can be applied in both the general population and in multiple clinical populations. There is a shorter 20-item version (PSI-20) with excellent psychomotor properties for screening.
Aim. To study the convergent and divergent validity of the PSI and PSI-20, by analysing how their scales reflect the day-today consequences of real deficits found in neurological assessment performed by means of performance tests.
Patients and methods. A sample of 52 persons undergoing treatment for substance addiction (31 males and 21 females) were administered the PSI together with an abbreviated neuropsychological examination battery focused on describing attentional, mnemonic and executive processes.
Results. Both versions of the PSI present optimal psychometric properties (0.78 > alpha > 0.94 for the complete 46-item version and 0.7 > alpha > 0.89 for the abbreviated 20-item version). The results confirm the hypotheses regarding their validity: the performance problems scale is related with the capacity to resolve tests that supposedly rate the executive functions of a prefrontal origin (convergent validity), whereas the scales of problems in emotional control and problems
with social behaviour are not related with those cognitive capabilities (discriminant validity).
Conclusions. The PSI is a test that is clinically useful, psychometrically valid and applicable in multiple clinical populations.