Food-searching strategies in young rats: Win-shift predominates over win-stay.

Abstract
The ability of rats to follow different food-searching strategies was examined in a test of spatial memory. In a win-shift procedure, rats were rewarded for choosing locations different from those just chosen, and in a win-stay procedure they were rewarded for returning to the locations just chosen. In a 3rd procedure, rats were rewarded for every choice. The win-shift strategy was learned rapidly and was performed well; the win-stay strategy was learned slowly, if at all. When every choice was rewarded, rats exhibited a preference for following a win-shift strategy. Rats were disposed to follow a win-shift strategy when searching for food. They were able to learn a win-shift procedure better than a win-stay procedure. When any choice produced reward, they preferred to follow a win-shift strategy. The influence of this win-shift disposition on food gathering in the wild, and on performance of laboratory discrimination tasks, was discussed.