Summary: This study evaluates whether the combined treatment of methylphenidate and non-invasive brain stimulation, called intermittent theta burst stimulation, can effectively treat apathy in individuals with Alzheimer's disease or mixed AD/vascular dementia

Summary: Cancer-related fatigue is a common and debilitating late effect in pediatric brain tumor survivors. Currently, evidence-based recommendations to ameliorate this condition are lacking. The researchers will investigate the ability of methylphenidate to improve fatigue and cognition in pediatric brain tumor survivors suffering from cancer-related fatigue. Methylphenidate is a drug (central nervous st...

Summary: The goal of this observational study is to learn if and how pharmacological and psychotherapeutic group treatments can treat clinical symptoms of children and adolescent patients with ADHD. The main questions it aims to answer are: * Are pharmacological and psychotherapeutic treatments effective on the clinical symptoms of patients with ADHD? * Are pharmacological and psychotherapeutic treatments ...

Summary: The Pharmacogenomics of Stimulant Treatment Response (PGx-STaR) study aims to identify genetic profiles related to methylphenidate treatment outcomes in children and adolescents aged 6-24 with Attention deficit/hyperactivity disorder (ADHD).

Objective: • Assess the feasibility, acceptability, and adherence to MPH treatment in children with SCD and EF deficits. Secondary Objective: • Evaluate neurobehavioral and safety outcomes following MPH treatment. Exploratory Objective: • Evaluate decision-making and determinants influencing methylphenidate utilization among parents.

Summary: To learn if Cognitive Behavior Therapy (called CBT), combined with either Bright Light Therapy (called BLT), methylphenidate, and/or melatonin, can help improve sleep and other related symptoms such as fatigue, anxiety, and depression in cancer patients. This is an investigational study. In this study, BLT, Methylphenidate and Melatonin will be compared to their placebos.

Summary: This study is a pragmatic clinical trial examining the comparative effectiveness of two stimulant medications (methylphenidate and amphetamine) in the treatment of ADHD in children and adolescents with autism. Using a sequential, multiple assignment randomization trial (SMART) design the study will not only assess these two medications but also the role of an increasingly popular class of ADHD med...

Summary: The goal of this clinical trial is to learn about the mechanisms of oxygen toxicity in scuba divers. The main questions it aims to answer are: * How does the training of respiratory muscles affect oxygen toxicity? * How do environmental factors, such as sleep deprivation, the ingestion of commonly utilized medications, and chronic exposure to carbon dioxide, impact the risk of oxygen toxicity? * H...

Summary: The investigators' goal is to develop neuroimaging biomarkers to predict response to treatment with methylphenidate, which then can be used in the development of novel pharmacological treatments for attention-deficit/hyperactivity disorder (ADHD). The overall objective of this study is to measure the changes in task-related neural activity related to symptoms of ADHD (measured by functional MRI) a...

Summary: This study seeks to provide insight on psilocybin's effects on mechanisms of chronic pain among patients with co-morbid chronic low back pain and depression (CLBP+D). Participants will receive either a single high-dose of psilocybin (25mg absolute dose) or methylphenidate (40mg absolute dose). Participants will be asked to complete assessments of pain, depressive symptoms, and more general questio...

Summary: The aim of this study was to investigate the effect of treatment of ADHD with methylphenidate on neuroinflammation by examining the levels of Interleukin-6 (IL-6), S100B, Claudin-5 in serum samples of patients who were diagnosed with attention deficit hyperactivity disorder (ADHD) and started or planned to start methylphenidate for treatment as per routine, at month 0 before the initiation of meth...

Objectives: The objective is to determine the acute and chronic impact of the orexin antagonist, suvorexant, on neurobiological and behavioral factors linked with substance use disorders. Whether such effects are mediated by baseline characteristics will be tested. Given suvorexant is an FDA approved treatment for insomnia, sleep will be evaluated as well in the nicotine dependent arm. Endpoints: In nicotine-...