Which of the following is NOT a characteristic of attention-deficit hyperactivity disorder (ADHD)?

High attention span is indeed not a characteristic of attention-deficit hyperactivity disorder (ADHD). In fact, individuals with ADHD typically struggle with sustaining attention on tasks or activities, especially those that require prolonged mental effort or are considered boring. This frequently leads to challenges in school and other structured environments, where maintaining attention is crucial. The presence of impulsivity, hyperactivity, and distractibility, on the other hand, are hallmark characteristics of ADHD. Impulsivity refers to acting without thinking about the consequences, hyperactivity involves excessive movement or difficulty remaining still, and distractibility indicates difficulty in maintaining focus in the presence of competing stimuli. Each of these traits contributes to the overall difficulties associated with ADHD, further highlighting why high attention span stands out as not aligning with typical behaviors associated with this disorder.