A new UK-based study in the Journal of Attention Disorders explores undiagnosed ADHD and ASD in a population of mostly female adult volunteers drawn from the general population. The researchers included only participants who had never received a diagnosis of ADHD, ASD, dyslexia or another mental disorder. A new Canadian study in the International Review of Neurobiology also found an overlap in neurodevelopmental disorders. The study’s authors note that 85% to 90% of patients with Tourette syndrome and other tic disorders have comorbidities and manifest an overlapping spectrum of “sensory-, behavioral-, cognitive- and sleep-related problems that have a major impact on their functioning and quality of life.” These comorbidities commonly include ADHD, ASD, obsessive-compulsive disorder (OCD) and mood and anxiety disorders. Multiple studies have pointed to heavy metals as the leading culprit in the cascade of neurodevelopmental disorders.