Explain why psychiatric assessors are described as needing to recognise involuntary neurological movement signs, even though these are primarily neurological rather than psychiatric in origin.

These movements can be mistaken for primarily psychiatric motor signs, such as catatonic stereotypy, so a psychiatric assessor who is unfamiliar with their characteristic neurological quality and distribution risks misattributing them to a psychiatric process. Some, such as chorea, also have direct psychiatric relevance through their underlying neurological disease, since conditions like Huntington's disease carry significant psychiatric manifestations of their own alongside the movement disorder. Recognising the characteristic quality, distribution, and broader neurological and medical context of each specific pattern, rather than assuming any unusual movement is psychiatric in origin, is therefore an essential skill for accurate assessment and appropriate referral.