According to PoB, Jimmy's arm flapping, head rolling, eye squinting, and full-body rocking is probably a result of

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Jimmy's repetitive behaviors (arm flapping, head rolling, eye squinting, and full-body rocking) are likely a result of automatic reinforcement. This means that he engages in these behaviors because they produce a pleasurable or otherwise reinforcing sensation or experience for him, regardless of any social or environmental contingencies. This is a common feature of many individuals with autism spectrum disorder or other developmental conditions.

According to PoB, Jimmy's Arm Flapping, Head Rolling, Eye Squinting