常常可以发现上幼儿园,乃至已上小学的孩子,其中特别是女童,会无意识地咬自己的手指甲,甚至啃得流了血。但即便如此,往往仍不能阻挡其继续啃咬。美国的一些儿童心理学家指出,在学龄前幼儿的所有神经性习惯中,咬指甲是最为常见的一种,而且如不能有效地加以纠正,这种病态表现还可 Often, kindergartens and even elementary school children are found. Among them, especially girls, can unconsciously bite their fingernails and even chew their blood. But even so, often can not stop it from continuing to chew. Some child psychologists in the United States point out that biting nails are the most common form of all neurological habits among preschool children, and if not corrected effectively, this pathological manifestation can be