A patient following a stroke fails to recognise her own left arm as belonging to her, insisting it belongs to someone else, but she readily notices and responds normally to objects, food, and people on her left side more generally. Before revealing the answer: is this hemispatial neglect?

No, this is more consistent with hemiasomatognosia than with hemispatial neglect. Hemispatial neglect would involve a broader failure to attend to external space generally, including objects, food, and people on the affected side; here, her awareness of the external left side is intact, and the disturbance is specifically confined to her own body, the defining feature of hemiasomatognosia rather than the broader spatial neglect.