Serial order learning in associative formation

Serial order learning was investigated in rats by delivering food to two spatially distinct feeders. All rats received three food pellets in feeder A delivered 10 min into the session. Three additional pellets were then delivered in feeder B after 20s, in Group Short (S), or 150 s, in Group Long (L). The rats in Group S learned the A-B association better than the rats in Group L. Of more interest, however, was that the rats in Group S showed more anticipatory responding to feeder A, suggesting subjects had better learned that feeder A delivered food "first". Implications for classical conditioning and serial order learning are considered.