Number processing and calculation in a case of visual agnosia

We describe the performance of a brain-damaged subject who suffered from vi sual agnosia leading to major difficulties in generating and exploiting vis ual representations from long-term memory. His performance in a physical ju dgement task in which he was required to answer questions about the visual shapes of Arabic numerals reflected his agnosic problems. However, he showe d no impairment in usual number processing and calculation tasks. This case shows that, despite some commonalities in number and object processing, ac tual numerical processes are not affected by visual agnosia and can be pres erved even when fine visual processes are impaired.