Engaging in one-sided, long winded conversations, without noticing if others are listening or are trying to change the subject;
Displaying unusual, non-verbal communication such as, lack of eye contact, few facial expressions, or awkward body postures and gestures;
Pedantic and rigid viewpoint;
Showing an intense obsession with one or two specific, narrow subjects, such as sporting statistics, particular cars, train time-tables, or reptiles;
Appearing not to understand, empathise with, or be sensitive to other's feelings;
Having a hard time "reading" other people or understanding humour or sarcasm;
Speaking in a voice that is monotonous, rigid, or unusually fast;
Moving clumsily, with poor coordination;
Having an odd gait or posture.
