ラットの放射状迷路遂行における指示忘却

概要

論文の詳細を見る
Directed forgetting is a phenomenon that memory performance becomes poorer when no following test is signaled. Some studies have examined directed forgetting in rats but several artifacts possibly influenced the results. The present study examined directed forgetting in rats using a new procedure to control possible artifacts. Rats were trained to acquire a win-shift task on a radial maze. In the learning phase, rats were allowed to enter all eight arms and get food rewards set at four arms that were randomly determined trial by trial. Two discriminable holding cages in which rats were kept during the retention interval between learning and test phase served as R- and F-cues that signaled presence or absence of a following test. In the test phase following the R-cue, rats were required to avoid arms where they had gotten food in the learning phase. Following the F-cue, rats received forced choices to baited arms. After rats acquired the win-shift task reliably, probe tests following F-cue were inserted into the original training. Rats showed poorer performance on the probe test than on the normal test. The results suggest that major non- memorial accounts can be rejected and give good evidence of active control of memory rehearsal in rats.
2013-03-30