@article{oai:kanazawa-u.repo.nii.ac.jp:00000202,
 author = {Kamijo, Makiko and Taniuchi, Tohru and 上條, 槙子 and 谷内, 通},
 issue = {1},
 journal = {心理学の諸領域 = Bulletin of Hokuriku Psychological Society of Japan},
 month = {Jan},
 note = {Five rats were trained to respond to the third object of six identical objects arranged in a line. All rats could learn this task reliably when it consisted of one kind of object stimulus (A). Since spatial locations of objects were changed trial by trial, a spatial position of the stimuli could not be an effective discriminative cue. Utilization of olfactory cue of food reinforcers also could be rejected because food rewards were set in the rear of all stimuli but rats could get it only when a correct response was made. When the stimulus type increased to three (A, B and C), three of the ve rats could learn this task reliably. In the transfer test, a novel object D was inserted as a probe test to the original training. On a probe trial, response to the second, third or fourth object were reinforced indifferentially. Chance performance as a result of additional learning to the novel test stimulus during repeated probe trial was 33.3%. Two rats showed reliable transfer to the novel test object. The results suggest that rats can encode abstract numerical features of object stimuli.},
 pages = {2--9},
 title = {ラットにおける物体刺激の数的弁別学習},
 volume = {1},
 year = {2012}
}