我儿子是小学二年级学生。最近几个月,他老是做怪相——眨眼、吸鼻、耸肩,我们骂他也无济于事。即使是在上课时,孩子也经常有这些表现,有时还发出奇怪的声音,引得同学们哄堂大笑。最近带他到医院做脑电图检查,结果正常。请问,孩子为何会这样?是不是脑子有病? My son is a sophomore in primary school. In recent months, he has always done strange things - blinking, sniffing, shrugging, and scolding him for no avail. Even in class, children often have these performances, sometimes making strange voices, drawing students to laughter. Recently took him to the hospital for EEG examination, the result was normal. Excuse me, why does the child do this? Is not the brain sick?