a neuropsychological tool for assessing visuospatial perception and the ability to distinguish visual images. It usually involves the presentation of geometric shapes or patterns that the subject must recognize, distinguish or reproduce. The test helps to identify disorders of visual processing, spatial orientation and perceptual organization, often associated with lesions of the parietal or occipital lobes of the brain. It is used to diagnose and monitor patients with stroke, traumatic brain injury and neurodegenerative diseases.