Studies of Brain and Body Interaction

This trial is studying how the brain and body interact in people living with neurological and developmental conditions, using non-invasive measurements and assessments to better understand how these disorders work and how to improve treatments. **You may be eligible if...** - You have a clinical diagnosis of one of the following conditions: - Autism Spectrum Disorder (ASD) - Attention Deficit Hyperactivity Disorder (ADHD) - Asperger's syndrome - Alzheimer's disease - Fragile X syndrome (a genetic condition that affects learning and behavior) - Parkinson's disease - You are willing and able to participate in study assessments **You may NOT be eligible if...** - No specific exclusion criteria are listed for this study — if you have one of the qualifying diagnoses, you may be able to participate regardless of age or other health conditions - You are unable to consent to participate Talk to your doctor to see if this trial is right for you.