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Introduction The diagnosis of Autism Spectrum Disorders is currently witnessing several changes, with direct consequences on the prevalence rates in the general population. However, little is known about ASD traits prevalence in clinical samples, and how much these traits interact with other mental health conditions, especially in young adults, a critical age for the outbreak of many psychiatric diseases. Objectives The aim of this study was to assess the prevalence of ASD traits in a sample of young adults (aged between 18 and 24 years old) referring to a specialized mental health outpatient clinic. Methods We administered to 259 patients the Autism Quotient (AQ) and the Ritvo Autism and Asperger Diagnostic Scale-Revised (RAADS‐R), along with a detailed sociodemographic and anamnestic interview. Results We found that 16.2% of our sample scored above the cut-off at both scales (a percentage that went down to 13.13% when restricting the RAADS-R cut-off at >119, as suggested for clinical samples). Conclusions This prevalence seems considerably higher than the one reported in the general population, and not negligible. The association with sociodemographic features such as sex assigned at birth, gender identity and employment status, and the validity of the screening tools we implemented, are discussed. In conclusion, we suggest that an assessment for autistic traits should be implemented in young adults seeking help for unspecified psychiatric symptoms and psychological suffering and that, despite the not unanimous consensus over self-report screening tools, a positivity to both the AQ and the RAADS-R should lead the clinician to conduct a full diagnostic evaluation with structured or semi-structured interviews. Disclosure of Interest None Declared

Introduction Motor Conversion Disorders (also called Functional Movement Disorders, FMD) are a group of neuropsychiatric conditions characterized by neurological symptoms of altered voluntary motor function that cannot be explained by typical neurological diseases or other medical conditions. In the last decade, several hypotheses have been formulated with respect to their pathophysiology, and a major line of research, trying to integrate psychological, cognitive, and neurobiological factors, focused on the subjective experience that patients feel of their own bodies. However, no study has, so far, directly investigated their Body Schema (the implicit sensorimotor representation of one’s own body) and its plasticity. Objectives To investigate the Body Schema in patients with FMD through a paradigm specifically designed to assess their perceived body metrics, through a spatial estimation of body parts length, and to compare their results with the ones obtain on a group of healthy control subjects (HC) Methods 10 patients with FMD and 11 HC underwent the Forearm Bisection Task, aimed at assessing perceived body metrics, which consists in asking the subject, blindfolded, to repeatedly point at the perceived middle point of their dominant forearm with the index finger of their contralateral hand, and a psychometric assessment for anxiety, depression, alexithymia, and tendency to dissociation. Results FMD patients bisected their forearm more proximally (with an increased shift towards their elbow equal to 7.5%) with respect to HC; average bisection point was positively associated with anxiety levels in the whole sample, and with the tendency to dissociation in the FMD group. Conclusions FMD patients seem to perceive their forearm as shorter than HC do, which might suggest an alteration of their Body Schema. The Body Schema can go through short- and long-term plastic changes in the life course, mainly related to the use of each body segment; we speculate that, despite FMD being a disorder of functional nature, characterized by variability and fluctuations in symptomatology, the lack of sense of agency over a body part might be interpreted by the nervous system as disuse and hence influence the Body Schema, as deficits of organic aetiology do. Disclosure of Interest None Declared

Introduction Neurofilmology is a young and evolving research field, at the intersection between neuroscience and movie experiences, that explores how the brain processes and responds to visual storytelling. It involves examining the cognitive and emotional effects of movies on viewers, including social cognition and perspective-taking aspects. However, up to date, these studies have focused only on the neurotypical population, hence constituting a considerable gap in the literature with respect to individuals with neuroatypical functioning. Objectives Aim of this study was to investigate the experience of film viewing and its correlates in individuals with a diagnosis of Autism Spectrum Disorders (ASD). Methods 30 neurotypical individuals and 30 individuals with ASD without intellectual disabilities were asked to observe 12 short video clips of 3 seconds length, showing an agent grasping an object from a table, and filmed with three different camera techniques: Still, Steadycam, Zoom; for each clip, they were asked to respond to six question on a Visual Analogue Scale (0-100) designed to investigate participants’ potential feeling of involvement with the observed scene, their comfort with the different filming conditions, and their estimation of the ecological plausibility of the different types of camera movements. Results Participants felt more involved watching videos filmed with a Steadycam, with respect to the Zoom and Still condition. Within the neurotypical group participants felt more comfortable when the camera was in motion (both Steadycam and Zoom condition) compared to the Still condition; no differences were found between conditions in the ASD group, as if they felt equally comfortable in every condition administered, regardless the filming technique. Conclusions First, our results reinforce prior findings regarding the influence of different camera techniques on neurotypical individuals. Second, they add to the existing literature suggesting that individuals with ASD may exhibit differences in their subjective experiences related to empathizing with characters and immersing themselves as actors when the camera replicates naturalistic movements, resulting in a diminished overall fulfillment in the movie-watching process. Disclosure of Interest None Declared

Introduction Attention–Deficit/Hyperactivity Disorder (ADHD) is a heterogeneous neurodevelopmental disorder encompassing developmentally inappropriate inattentiveness, hyperactivity, and increased impulsivity (DSM-5). Symptoms presentation is different for different stages of life; moreover, individuals with ADHD symptomatology can develop abilities and strategies that help them adapt and mask the distinctive features of the condition, thus reducing the functional impairment usually seen in ADHD subjects, and ultimately not receiving neither a clinical diagnosis nor a proper therapeutic support. They might express their lack of well-being through other transdiagnostic symptoms, and finally reach psychiatric attention for potential comorbidities. Hence, it was argued that the existence of children and adolescents with subthreshold and underrecognized symptoms that subsequently develop into a full diagnosis suggests that ADHD should be significantly more considered in adult mental health settings. Objectives Here we aimed to analyse the prevalence of ADHD symptoms and traits in a heterogeneous clinical psychiatric sample of young adults (aged 18 to 24 years old), who referred to a specialized outpatient clinic for various psychiatric and psychological disturbances. Methods 259 participants completed three validated self-report screening questionnaires for ADHD: the Wender Utah Rating Scale (WURS), the Adult Attention-Deficit/Hyperactivity Disorder Self-Report Screening Scale for DSM-5 (ASRS-5), and the Conners’ adult ADHD rating scale (CAARS). Results 12.4% of our sample scored above the cut-off at both the WURS and the ASRS-5 and was considered at risk of ADHD. Conclusions The prevalence rate in our sample is higher than the one found in the adult general population (6.76%), and in the lower range of the one found in the adult clinical population (6.9% to 38.8%). We discuss the potential role of sociodemographics (age, sex, gender identity, and employment) and comorbidity factors. Differences in the clinical presentation of ADHD according to sex assigned at birth and age should be considered during every psychiatric evaluation to minimize the risk of underdiagnosis. We advocate for further studies investigating the prevalence of ADHD in different psychiatric services for adults, and for a stronger presence of specialistic ADHD services and trained clinicians on the territory: this would increase diagnostic reliability, consequently providing a better treatment for ADHD in adults, and facilitate the transition from pediatric to adult’s services. Disclosure of Interest None Declared

Introduction Recent research on Schizophrenia (SCZ) suggests that reduced sleep spindle and slow wave density could be particularly informative of underlying thalamocortical and cortical synchronization mechanisms and dysfunctions. Although sleep disturbances are also highly prevalent across all stages of Bipolar Disorder (BD), the objective evaluation of sleep macrostructure and microstructural oscillatory activity remains understudied in this population. Objectives We aimed to investigate sleep EEG activity in BD, with a focus on sleep architecture, sleep spindles and slow waves. Methods We recorded high-density EEG (64–channel BrainAmp, Brain Products GmbH, Germany) during sleep in 18 euthymic patients with BD and 18 age/gender-matched healthy control (HC) subjects. After sleep scoring and EEG artifact rejection, several parameters of sleep spindles (12-16 Hz), including density and amplitude, and slow waves (0.1-4 Hz) were identified for the first cycle of sleep using automated algorithms and compared between groups using non-parametric statistics. Results BD subjects showed significantly higher Wake After Sleep Onset and lower Sleep Efficiency (Table 1). Total (12 - 16 Hz), slow (12 - 14 Hz) and fast (14 - 16 Hz) sleep spindle parameters of density (Image 1) and amplitude did not differ significantly between groups. On the other hand, slow wave density was reduced in a large frontal cluster of electrodes in the BD group (Image 2). Table 1 BD (n = 18) HC (n = 18) Difference (p value) WASO (min ± sd) 140,61 ± 74,23 84,34 ± 59,84 0,017 Sleep efficiency (% ± sd) 72,47 ± 14,33 82,43 ± 11,58 0,028 Image: Image 2: Conclusions The absence of sleep spindle deficits in the BD group suggests that the systems involved in generating and maintaining these thalamocortical oscillations are presevered during periods of clinical stability in Bipolar Disorder. Conversely, reduced sleep slow wave density points to an altered cortical synchronization, which might represent a common neurophysiological feature shared with Schizophrenia. Further research is needed to confirm these preliminary observations in all–night recordings and with a direct comparison of larger cohorts of patients with both diagnoses. Disclosure of Interest None Declared