Perhaps you should try some spelling variations:
visual regions » visual response, visual neurons, visual responses
nice worlds » ice worlds, nice words, life worlds
co primary » two primary, 3 primary, 5 primary
2008 nice » 2008 venice
4 primary » 3 primary, 1 primary, 5 primary

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: 2008 nice worlds ((2 primary) OR (((co primary) OR (4 primary)))) visual regions.
• The words AND, OR and NOT may confuse the search; try adding quotes: "2008 nice worlds ((2 primary) or (((co primary) OR (4 primary)))) visual regions".
• Adding a wildcard symbol may retrieve word variants: 2008 nice worlds ((2 primary) or (((co primary) OR (4 primary)))) visual regions*.