Four male rats (Rattus norvegicus, Long-Evans) 114 days old at pretraining were tested using ping pong balls with food-flavoring odors as discriminanda. Two same-odor and one different-odor balls were presented on each trial, and 60 different problems were administered each to an 80% correct criterion or 100 trials. To assess conceptual use of oddity the first trial of each problem was used; Trials 2 and 3 were used to assess learning set performance. One rat had two significant runs of correct first trials, but he did not sustain it. All rats showed rapid improvement on Trials 2 and 3 affirming their excellent learning set formation. The need and means for continued investigation of oddity concept learning by rats are discussed.
Bailey, Aileen M. and Thomas, Roger K.
"An Investigation of Oddity Concept Learning by Rats,"
The Psychological Record: Vol. 48
, Article 9.
Available at: http://opensiuc.lib.siu.edu/tpr/vol48/iss2/9