autism

is marked by atypical interpersonal responses and literal including hyper-focus, repetitive or rigid adherence to language, processes or rules. Autism comes in two major classifications based on self-sufficiency:

HIGH (HFA) Savant pattern recognition, detail retention, extraordinary stamina for cognitive tasks, social relations framed by logic

LOW (LFA)  noticeable cognitive limits, “childlike” naiveté, with basic verbal responses or echoing