Which of the following is NOT a category of disability added by the Individuals with Disabilities Education Act (IDEA)?

The category of disability that is not specifically included in the Individuals with Disabilities Education Act (IDEA) is attention-deficit hyperactivity disorder (ADHD). While the act recognizes several categories of disabilities to ensure that students receive appropriate educational services, ADHD itself is not listed as a separate category. Instead, students with ADHD may be categorized under other existing classifications, such as "other health impairment" if their condition significantly impacts their educational performance.

In contrast, the other categories mentioned—traumatic brain injury, emotional disturbance, and autism—are explicitly defined within IDEA. Each of these categories has specific criteria and guidance regarding the identification and provision of services for students who fall under them, ensuring a structured framework under which affected students can access the support they need.