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Performance of adult common treeshrews (Tupaia glis) in an 8-arm and a 16-arm enclosed radial maze was investigated. In Experiment 1, four males and one female treeshrews were trained in the 8-arm maze for 20 days. They improved in choosing an unvisited baited arm during training, and reached a level significantly better than chance in the second 10-day period.Most subjects often ran to the next arm 45 degrees apart from the previously chosen one. Selection of the adjacent arm was more frequent after correct than incorrect response and decreased as the succession of arm entries on the daily trials. In Experiment 2, the same subjects were shifted to the 16-arm maze and trained similarly. They did not show any reliable improvement, but displayed a tendency to choose the next arm next to the chosen one (45 degrees apart). In Experiment 3, delay and cue-utilization tests were given to three of the five subjects again in the 8-arm maze. The results revealed that they dominantly used extramaze cues and suggested the poor level of their spatial working memory ability.

Performance of Common Treeshrews (Tupaia glis) in an Enclosed Radial-arm Maze : A Preliminary Research