Autistic people with intellectual disabilities appear to be at increased risk of schizophrenia. While current recommendations emphasize adapting interventions used for people with schizophrenia in general, few studies to date have investigated treatment of co-occurring schizophrenia in this specific population. To explore what interventions are…

Fragile X syndrome (FXS) is characterized by variable neurobehavioral abnormalities, which leads to difficulties in developing and evaluating treatments and in determining accurate prognosis. We employed a pediatric cross-sectional sample (1,072 males, 338 females) from FORWARD, a clinic-based natural history study, to identify behavioral subtypes…

CDKL5 deficiency disorder (CDD) results in early-onset epilepsy and lifelong cognitive and motor impairments. With no validated measure for communication in CDD, this study evaluated the psychometric properties of the Communication and Symbolic Behavior Scales-Developmental Profile Infant Toddler Checklist (CSBS-DP ITC). Caregivers (n = 150;…

Introduction: Adults with intellectual disabilities (ID) face a high risk of developing psychiatric disorders, yet there is a lack of valid instruments measuring psychopathology in this population. Two existing instruments are the PAS-ADD Checklist questionnaire and the Mini PAS-ADD interview, two third-party assessments that can be used for the…

Introduction: The aim of this study was to adapt the Health of the Nation Outcome Scales for people with Learning Disabilities into French (F-HoNOS-LD) and to examine its validity and reliability. Method: Sixty-six adults with intellectual disabilities (ID) admitted to a psychiatric hospital took part in the study. Clinicians used the F-HoNOS-LD…

Cornelia de Lange syndrome (CdLS) is associated with repetitive and self-injurious behaviors (RBs, SIB). Evaluating children with CdLS, this study: (1) characterizes the spectrum of RBs; (2) characterizes the impact and severity of RBs including SIB; (3) describes how age and adaptive functioning relate to RBs including SIB. Fifty children…

This paper reports on a qualitative, longitudinal case study conducted in England that explored the transition experiences of autistic students with intellectual disabilities (ID) as they left special school to go to colleges of further education (FE). Sequential interviews with six young people, their parents/carers and educators were developed…

A systematic review was completed to identify assessments used with children with intellectual disabilities to assess adaptive behaviour, challenging behaviour and autism-related behaviour and consider their appropriateness for use by special education teachers with autistic pupils. The findings of this review led to the recommendation that the…

In March 2020, many schools were closed to prevent the spread of COVID-19 in Japan, and it is predicted that many children, especially those with neurodevelopmental disorders (NDDs), will be affected emotionally and behaviorally. Here, we examined the impact of school closures due to COVID-19 on school-aged children with NDDs using the Child…

Irritability and aggression (IA) are highly prevalent in individuals with autism spectrum disorder (ASD). Although clinical correlates of IA in this population have been previously examined, findings from existing studies capturing symptoms as a set of latent variables do not fully explain meaningful associations between the symptoms themselves.…

Background: The Developmental Behaviour Checklist (DBC) is an established, internationally used questionnaire for assessing behavioural and emotional problems among young people with developmental or intellectual disabilities (ID). The present study aims to evaluate the psychometric properties of its German teacher version (DBC-T). Method: The…

Background: As both epilepsy and challenging behaviour are highly prevalent in adults with intellectual disability (ID) it is important to explore any potential relationships between the two to inform patient care. The aim of the present study was to investigate the relationship between epilepsy factors and challenging behaviour in adults with ID.…

Introduction: The purpose of this study was to gain additional insight on patterns of behavior of three individuals dually diagnosed with intellectual disability (ID) and bipolar disorder as they cycled between elevated and depressed mood states. Methods: Data were collected from weekly, one-hour observations across a period of several months. The…

Background: Fragile X syndrome (FXS) is the most common cause of inherited intellectual disability among men. This syndrome is frequently underdiagnosed in adults. The aim of this study was to develop and validate a French translation of the screening checklist "Fragiele-X screeningslijst." Method: The validation sample for the…

Psychiatric disorders in individuals with co-occurring autism spectrum disorders (ASD) and intellectual disability (ID) are common, but diagnosis presents many challenges. The Psychopathology in Autism checklist (PAC) is among the very few instruments specifically developed for this group of individuals. The psychometric properties of the PAC…