孤独症经常指自闭性疾病或幼儿自闭症,是一种在3岁以前发生的复杂的行为异常。孤独症患儿以缺乏社会交往及交流能力、有重复性模式化的行为为基本表现。很多孤独症患儿的症状是逐渐出现的,约30%有“退行性”表现。50%～70%的孤独症儿童通过非语言的IQ测验表现为智力低下。符合孤独症诊断标准的2～3岁儿童中约25%后来开始说话和 Autism often refers to autistic or toddler autism, a complex behavioral disorder that occurs before the age of 3 years. Children with autism lack of social interaction and communication skills, repeated patterns of behavior as the basic performance. A lot of children with autism symptoms are gradually emerging, about 30% have “degenerative ” performance. Fifty to seventy percent of children with autism show mental retardation through nonverbal IQ tests. About 25% of children aged 2-3 years who meet the diagnostic criteria for autism started to speak later