ラットの放射状迷路課題における順向性干渉に及ぼす報酬刺激の質的移行の効果

概要

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Present study examined effects of shift in reward quality on magnitude of proactive interference in radial maze performance by rats. Eight-arm radial maze and forced choice-free choice recognition task was used. In this task, rats received initial forced choice of four arms and then tested on free choice. Two groups of rats were given with three trials per day under 60s of retention interval and inter-trial interval. There were two kinds of food rewards, a 45 mg food pellet and one piece of 35 mg puffed rice. In Control group, same food reward was used on all three trials in a day, whereas in Experimental group, quality of reward was changed from Trials1-2 to Trial 3. In the both groups, choice accuracy declined over the trials, but shift in reward quality did not alleviate magnitude of proactive interference (Figure 2). These results were discussed in terms of contents of event memories that mediate radial maze task.
金沢大学の論文
2004-03-05