The Danish Version of the 20-Item Prosopagnosia Index (PI20): Translation, Validation and a Link to Face Perception.

Developmental prosopagnosia (DP) is a neurodevelopmental condition characterized by face recognition problems. Psychometrically sound self-report measures of face recognition problems are important tools in classification of DP. A widely used measure of such problems is the 20-item prosopagnosia index (PI20). Here, we present a Danish translation of the PI20 (PI20 _DK ). We administered the PI20 _DK alongside three objective measures of face and object processing performance to 119 participants to validate the PI20 _DK . Further, we assess the underlying factor structure of the PI20 _DK . Finally, as the first study in the field, we investigate the association between self-reported face recognition ability and face perception performance. The project was preregistered prior to data collection. The results suggest excellent convergent validity, discriminant validity and internal consistency for the PI20 _DK . A confirmatory factor analysis, however, indicates a suboptimal fit of the PI20 _DK to a one factor solution. An investigation of the association between the PI20 _DK and face perception suggests that the poor fit may reflect that the PI20 _DK measures problems with face recognition in general and not specifically face memory problems.