Asberger's symptom

Obsessional specialization
A pattern of behaviour characterized by detachment from everyday life, problematic personal relationships and a limited ability to communicate, unconventional behaviour, humourlessness, accompanied by an encyclopaedic knowledge and pedantic knowledge of an obscure subject. These symptoms may be a variant of autism. Patients suffer ridicule because the symptoms are regarded as the manifestation of a tiresome personality rather than as a medical condition.
(E) Emanations of other problems