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The American Psychiatric Association (APA) defines hyperactivity and impulsivity in a way that focuses on observable behaviors such as excessive talking and restlessness. Hyperactivity is characterized by an enduring level of high energy that manifests in constant movement or excessive activity, while impulsivity involves acting without thinking, which often entails speaking out of turn or an inability to wait for one's turn in social situations.

This definition emphasizes the observable actions associated with these behaviors, distinguishing them from other symptoms like distraction or difficulty in task completion. Excessive talking specifically highlights how impulsivity can lead to difficulty in regulating speech, showcasing a lack of control over impulses. As such, the emphasis on excessive talking and restlessness encapsulates the defining traits of hyperactivity and impulsivity as outlined by the APA.