ADHD, predominantly hyperactive-impulsive type: With this type, people have both hyperactive and impulsive behavior, but they may not show enough symptoms of inattention to fall into the combined type.
ADHD, predominantly inattentive type: People with this type have inattention but not hyperactive or impulsive behavior. This type of ADHD was formerly known as attention deficit disorder (ADD).
Attention deficit hyperactivity disorder (ADHD): A developmental and behavioral disorder. People that have ADHD have inattention, distractibility, hyperactivity, and impulsivity. Typically, symptoms are significant enough to cause problems in everyday life.
Attention deficit disorder (ADD): This is the former name of ADHD, predominantly inattentive type. The term ADD is no longer used.
Executive function deficit: Executive function is a set of mental skills that make sure things get done. Someone with an executive function deficit has a hard time planning or starting tasks and seeing them through. People with ADHD often have this deficit.
Clinical trial: Also called a research study, they test how well new approaches work in people. Clinical trials may compare a new treatment to a treatment that is already available.