“…Based on this assumption, clinical syndromes may be viewed as the result of multiple interactions between different and quite distinct psychopathological dimensions (Keshavan, Tandon, Boutros, & Nasrallah, 2008;Tandon, Nasrallah, & Keshavan, 2009 (Eaton, Thara, Federman, Melton, & Liang, 1995;Marchesi et al, 2015). Likewise, institutionalization, long-term neuroleptic therapy, illness duration and ageing may contribute to shape both clinical presentation and outcome (McGorry et al, 1998;Ruggeri et al, 2012;Marchesi et al, 2015). As the early stages of psychosis are not affected by long-term confounding factors (Langeveld et al, 2013), first episode psychotic patients may represent a particularly useful study population where to better explore clinical expression of the core symptoms of psychoses.…”