Analysing visuo-spatial neglect through figure-copying tasks

This paper describes the automatic analysis and diagnostic interpretation of hand-drawn geometric shapes implemented as part of a computer-based test battery for the assessment of visuo-spatial neglect in stroke patients. Visuo-spatial neglect is the inability of a brain damaged patient to react to visual stimuli on the opposite side to the lesion. The symptoms of neglect are not 'all-or-nothing' and therefore accurate assessment of the severity of the condition is important as it affects the treatment modality assigned to a patient and potentially the rate of recovery through post-stroke rehabilitation. The test system comprises a Wacom graphics tablet connected to a portable computer. Test overlays (A4 sized) are placed on the tablet and are completed by the patient.