Photoelastic stress pattern analysis using Fourier transform with carrier fringes: influence of quarter-wave plate error

The Fourier transform method, widely applied in photomechanics for the automated analysis of interferometric fringe patterns, has been recently extended to the photoelastic isochromatic fringe patterns analysis. Unfortunately, its use in photoelasticity involves some limitations that have not been completely highlighted in literature. This work deals with the influence of the quarter-wave plate tolerance on the evaluation of the retardation. Both theoretical and experimental analyses have shown that the quarter-wave plate error does not affect the retardation only if the principal stress directions in the model and in the carrier are aligned. In general, instead, the tolerance of the quarte…

What drives the higher incidence of psychosis in London compared to Palermo?

Background: Incidence of psychosis seems to be lower in Italy than in other European countries (Tansella et al. 1991; Lasalvia et al. 2012, Tarricone et al. 2012); however there are no studies comparing the incidence of psychotic disorder in Northern and Southern Europe. Methods: Incidence and socio-demographic data on all psychotic patients presenting for the first time to the mental health services of Palermo were collected over a period of three years. Palermo incidence rates were compared to South London rates obtained from the AESOP study (Kirkbride et al 2006). South London rates were reanalyzed excluding people aged 16-17 years and substance related psychoses. Second generation migra…

P.0171 The independent and joint effect of the endocannabinoid system and daily cannabis use on the risk of psychosis

Cumulative social disadvantage and psychosis: findings from a southern Italy case-control study

Aim: There are consistent evidence suggesting that psychotic disorders are associated to social disadvantage and isolation in adulthood, and research suggested that they these are not simply a consequence of the functional impairment related to onset of the disease (Stilo et al., 2013; Morgan et al., 2008). To date only a few studies have investigated the impact of social risk factors on psychosis in Italy. This study aimed to replicate existing findings in a case-control sample from Southern Italy. Methods: 134 individuals presenting for the first time to mental health services of Palermo (Italy) with an ICD 10 diagnosis of psychosis and 175 population controls from Palermo (Italy) were en…

Cannabis consumption and the risk of psychosis

Summary Objectives: Cannabis is the most widely used illicit drug globally and its use has been linked to an increased risk for psychotic disorders. An association between cannabis consumption and psychotic symptoms was consistently reported by several studies. This case-control study aimed to widen the current findings about the impact of cannabis exposure on the risk of psychosis, by investigating the pattern of cannabis consumption in a sample of first-episode of psychosis (FEP) patients compared to healthy controls. Material and methods: 68 individuals who presented for the first time to mental health services of Palermo (Italy) with an ICD-10 diagnosis of psychotic disorders and 74 hea…

Internet out of control: The role of self-esteem and personality traits in pathological internet use

Objective: Young people seem particularly likely to develop pathological Internet use (PIU) with the use of social networks, chat, and videos. Sensation-seeking, neuroticism, introversion, and low self-esteem are personality features frequently associated with the disease. The aim of this study was to replicate and to extend previous findings by exploring the combined effect of personality traits and self-esteem on PIU. Method: A sample of 652 male students attending vocational technical schools in Palermo (Southern Italy) was assessed using the following measures: the Zuckerman-Kuhlman Personality Questionnaire to evaluate personality traits; the Multidimensional Self-Concept Scale to asse…

P.0170 Distinct polygenic risk scores in clusters of psychotic subjects with different premorbid trajectories and current IQ

Perceived stigma in patients affected by psychosis: Is there an impact on relapse?

Introduction The World Health Organization (WHO) considers stigma of mental illness as a crucial problem (WHO, 2001). Stigma contributes to the onset (Morgan et al., 2010) and the outcome of people affected by schizophrenia (Himan, 2015). Objectives To evaluate the perception of patients affected by psychotic disorders of being stigmatized by the community. Aims To compare the perception of stigma among subgroups of patients at different stage of their disorder. Methods Thirty-five patients affected by a first-episode of psychosis (FEP) and 96 patients affected by chronic psychosis were recruited. The Devaluation of Consumers Scale (DCS) and the Devaluation of Consumer Families Scale (DCFS)…

Does age of first cannabis use and frequency of use influence age of first-episode psychosis (FEP)?

Background: Cannabis is one of the most commonly used drugs among young people across Europe (EMCDDA data 2014), Moreover, it is one of the most abused illicit drugs among patients suffering from schizophrenia (Linszen et al., 1994) and, particularly, in patients at their first episode of psychosis (Donoghue et al., 2011). Furthermore, patients suffering from psychosis with a history of cannabis use have an earlier age of onset of psychosis (AOP) than those who never used it (Di Forti et al., 2013). We aim to investigate if the reported association between use of cannabis and AOP is consistent across to European samples with expected differences in pattern of cannabis use (i.e. age at first…