Abstract:
:The present study examined the effect of lesions of the caudate nucleus or fimbria-fornix on the acquisition of two water maze tasks. In both tasks, two rubber balls with different visual patterns were used as platforms (i.e., cues). The "correct" cue was attached to a submerged rectangular platform and could be mounted by an animal to escape the water. The "incorrect" cue was attached to a thin round pedestal and could not be mounted. In a spatial version of the task, the correct cue was located in the same quadrant of the maze on all trials, whereas the visual pattern on the cue was varied from trial to trial. Lesions of the fornix, but not the caudate nucleus, impaired acquisition of this spatial task in relation to control animals. In a simultaneous visual discrimination version of the task, the correct cue on all trials was one with a specific visual pattern, and the spatial location of the correct cue was varied from trial to trial. Lesions of the caudate nucleus, but not the fornix, impaired acquisition of this visual discrimination task in relation to control animals. The double dissociation observed supports the hypothesis that the hippocampus and caudate nucleus are parts of systems that differ in the type of memory they mediate.
journal_name
Behav Neuroscijournal_title
Behavioral neuroscienceauthors
Packard MG,McGaugh JLdoi
10.1037//0735-7044.106.3.439subject
Has Abstractpub_date
1992-06-01 00:00:00pages
439-46issue
3eissn
0735-7044issn
1939-0084journal_volume
106pub_type
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