deviates so far from the norm that it
1. calls attention to itself
2. interferes with communication
3. causes listener or speaker distresswhen is language considered disorder?language disordercan be receptive or expressive and interferes with form, content, usegenetic/chromsomal, birth complications, toxins, gross brain diseases, maternal infectionsbiological causes of IDdeprivation, poor housing and diet, poor hygiene, lack of medical caresocial environmental causes of ID