objects outside the subitizing range, either failing to count certain objects, or alternatively counting the same object several times.

However, people with simultanagnosia have no difficulty enumerating objects within the subitizing range. The disorder is associated with bilateral damage to the parietal lobe, an area of the brain linked with spatial shifts of attention. These neuropsychological results are consistent with the view that the process of counting, but not that of subitizing, requires