Extrastriate visual cortex comprises a mosaic of anatomically and physiologically distinct areas which occupy a broad belt of cortex outside the striate area (area 17, or VI). These areas receive their major visual input directly or indirectly from striate cortex and are responsible for intermediate and high levels of visual processing. Much research over the past 15 years has been directed at several general issues: (1) How many visual areas are there, and how can they be reliably identified? (2) How are these areas interconnected? (3) What types of visual information are processed within each area?