Following a violent assault, a woman is found wandering in an unfamiliar town, unable to recall her name, address, or any personal history, yet she has navigated public transport and interacted appropriately with several strangers along the way. What is this?

This is dissociative amnesia, here with an accompanying fugue state: a sudden loss of memory, including personal identity itself, triggered by extreme psychological trauma, occurring alongside striking preservation of complex behaviour and social functioning (navigating transport, interacting appropriately) — exactly the pattern the phenomenon's own recognition features describe. It is not an amnestic state, which has an organic rather than psychologically-triggered onset and typically spares personal identity. It should not be assumed to be malingering, since the phenomenon's own text is explicit that this striking preservation-alongside-loss pattern is a recognised, genuine feature, not evidence of exaggeration, though the distinction can be genuinely difficult in a forensic context. And it is not dementia, which would not present with this sudden, trauma-linked onset or this specific pattern of preserved complex skills.