Final answer:
The most likely diagnosis for an individual exhibiting symptoms of hyperactivity-impulsivity but not inattention for the past 6 months is Attention Deficit Hyperactivity Disorder (ADHD), especially if these symptoms are beyond what is typical for their developmental stage.
Step-by-step explanation:
If enough symptoms of hyperactivity-impulsivity but not inattention have been present for the past 6 months, the most likely diagnosis would be Attention Deficit Hyperactivity Disorder (ADHD). ADHD is a neurodevelopmental disorder characterized by difficulty maintaining attention and controlling impulses, which includes symptoms of hyperactivity and impulsivity. The specified time frame of 6 months aligns with the diagnostic criteria for ADHD.
Attention Deficit Hyperactivity Disorder (ADHD) can manifest differently depending on the individual, and some may experience the hyperactivity-impulsivity subtype without significant inattention issues. Differentiating ADHD from other disorders such as Oppositional Defiant Disorder (ODD), Conduct Disorder (CD), and Autism Spectrum Disorder (ASD) is important since these disorders have specific features that may not overlap completely with ADHD.