Final answer:
The statement is false; the behaviors described align more closely with symptoms of ADHD rather than oppositional defiant disorder, which is characterized by frequent and persistent patterns of anger, irritability, arguing, defiance, and vindictiveness.
Step-by-step explanation:
A child who seems to be fidgeting, leaving his seat at school or the dinner table, climbing excessively on furniture or desks, talking too much, and is described as having no "off" switch would not be diagnosed with oppositional defiant disorder. This is false. The behaviors described are more characteristic of attention deficit hyperactivity disorder (ADHD), which is a neurodevelopmental disorder that includes symptoms such as inattention, executive functioning difficulties, impulsivity, and hyperactivity. ADHD is commonly treated with medication and behavioral strategies, and it often coexists with other disorders such as depression and obsessive-compulsive disorder (OCD). It is a condition that can affect both children and adults and requires a nuanced approach for diagnosis and treatment.