Chiu Yen-nan, a neurologist at National Taiwan University Hospital, lists the three main outward signs of a hyperactive child: extreme restlessness and inability to be still; inability to sustain concentration; and unpredictability and capriciousness.
台大兒童心理衛生中心醫師丘彥南指出，過動兒表現在外的行為有：過度好動不容易停下來、注意力無法持續專注、衝動等三個主要特徵。