The question describes a method where children with Attention-Deficit Hyperactivity Disorder (ADHD) receive a star sticker each time they complete a task without distraction. Once they collect five stars, they can exchange them for a toy. This technique is an effective behavioral intervention used in psychological and educational settings.
This method is known as a Token Economy. Let's break down why this is the correct answer and why the other options do not apply:
Thus, the effective psychological technique being used in the scenario is a Token Economy.