Individuals diagnosed with an intellectual disability (ID) share overlapping traits with those diagnosed with both ID and an Autism Spectrum Disorder (ASD). Therefore, the purpose of this study was to determine if caregivers' reports of symptoms of ASD are of value (i.e., when comparing them to clinical diagnoses of ASD) and to determine which…

Little research has been conducted on whether deficits in developmental functioning affect the range of core symptoms for autism spectrum disorders (ASD). This study represents a first attempt to determine whether developmental level has an effect on the expression of ASD symptoms in infants and toddlers. Eight hundred and fifty-three infants were…

Severe problem behaviors such as self-injury and aggression are frequently observed in young children under age 5 with intellectual and developmental disabilities (IDD). Although early identification of problem behavior is critical to effective intervention, there are few standardized measures available that identify severe problem behavior in…

The importance of social skills in development is a well studied area of research, and deficits in these skills can have implications long into adulthood. Therefore, assessment tools must be able to aid clinicians in identifying areas of weaknesses to target in treatment. The purpose of the current paper was to investigate the factor structure of…

Psychotropic medications are commonly used as an adjunct treatment in large-scale residential care facilities for adults with developmental disabilities. While the benefits of medication are noted, there are very severe conditions that can result from long term medication use. Tardive dyskinesia (TD) manifests as a variety of involuntary,…

The effect of developmental quotient on symptoms of inattention and impulsivity was examined among 198 toddlers with Autism Spectrum Disorders. There were two levels of developmental quotient: (1) low (less than or equal to 70; n = 80), and (2) typical (greater than 70; n = 118). Symptoms of inattention and impulsivity were assessed using 14 items…

Atypical antipsychotic medications are commonly used in large-scale residential care facilities for adults with developmental disabilities. While the benefits of this class of psychotropics are noted, debate exists whether the side effect profile of these medications outweigh their therapeutic benefit, especially in those who use them long-term.…

Previous research has proposed behavioral equivalents for depression, but evidence for behavioral equivalents has been contradictory. The relationship between a measure of depression and several proposed behavioral equivalents of depression was assessed in 693 adults living in a large residential setting. Most were adults with severe or profound…

Previous research has failed to address the possibility of behavioral equivalents in people with ID and mania. The relationship between a measure of mania and possible behavioral equivalents was assessed in 693 adults, most with severe or profound ID, living in a large residential setting. The mania subscale of the DASH-II proved to be a…

This study examined whether the number of psychotropic medications an individual is taking across classes influences side effects among adults with Intellectual Disability (ID). Participants were 80 adults diagnosed with ID. Dependent variables were the composite score and domain scores of the "Matson Evaluation of Drug Side-Effects" ("MEDS"),…

Behavioral symptoms of comorbid psychopathology of 651 children 17-37 months of age who were at risk for developmental disabilities were studied using the BISCUIT-Part 2. In Study 1, norms and cutoff scores were established for this new scale on this sample. In Study 2, frequency of response on the 52 items measured was reported. Problems in…

Autism spectrum disorders (ASD) and intellectual disabilities (ID) are high prevalence developmental disabilities that co-occur at high rates. Furthermore, Axis I psychopathology is known to occur more frequently in individuals with ID than the general population. The problems are lifelong and can be major impediments to independent living.…

Autism Spectrum Disorders are a class of conditions categorized by communication problems, ritualistic behaviors, and deficits in social behaviors. While evidence supporting a genetic component of Autism Spectrum Disorders (ASDs) is strong, no specific genetic marker has been identified. Thus, professionals have had to utilize intelligence tests…

Independent living is a goal for everyone, but often persons with intellectual disabilities (ID) have major challenges in this respect. In fact, deficits in daily living skills are a hallmark of the condition. One of the most serious and potentially problematic of the independent living skills is difficulties or irregularities in eating. These…