Effects of long-term restricted feeding on radial maze performance by aged rats.

Rats were fed every other day (EOD) from 3-21 months of age prior to training in an 8-arm radial maze with retention intervals of 0, 1 or 5 hr imposed between the fourth and fifth choices. Their performance was compared to that of another aged group fed ad lib throughout life prior to radial maze training and to 3 month old controls. Rats fed ad lib until training adapted to the maze more slowly than young controls and were impaired in acquiring accurate spatial memory. EOD feeding eliminated age-related differences in the initial rate of adaptation to the radial maze but had no effect on the development of accurate spatial memory at any of the retention intervals. These results indicate that differences in deprivation history are probably not responsible for previous findings that radial maze training early in life prevents the appearance of age-related deficits in accurate spatial memory.