Otoconia-deficient mice show selective spatial deficits.

Otoconia-deficient mice show selective spatial deficits.
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DOI:
10.1002/hipo.22300
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发表时间:
2014-10
期刊:
影响因子:
3.5
通讯作者:
Kirby, Seth L.
Kirby, Seth L.
中科院分区:
医学3区
文献类型:
--
作者:
Yoder, Ryan M.;Kirby, Seth L.

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前庭系统的损伤或失活会损害各种空间记忆任务的表现,但很少有研究试图消除半规管和耳石器官在这种表现中的作用。本研究通过评估耳石缺陷倾斜小鼠在桡骨臂迷宫和巴恩斯迷宫中的表现来测试耳石对空间工作和参考记忆的贡献。一个桡臂迷宫任务同时提供惊奇内和惊奇外线索,而另一个任务只提供惊奇外线索。巴恩斯迷宫任务只提供了额外的线索。在桡臂迷宫中,当有惊奇内提示时,倾斜小鼠的表现与对照小鼠相似,但当只有惊奇外提示时,倾斜小鼠的工作和参考记忆错误比对照小鼠更多。在巴恩斯迷宫任务中,对照组和倾斜小鼠在习得训练中表现出相似的潜伏期、距离和错误。在随后的探测试验中,两组人在目标象限中花费的时间比例最高,这表明他们能够使用额外的线索来指导他们的搜索。总的来说,这些结果表明,来自耳石器官的信号有助于空间记忆,但并非所有方面的空间表现都必需。
Damage or inactivation of the vestibular system impairs performance on various spatial memory tasks, but few studies have attempted to disambiguate the roles of the semicircular canals and otolith organs in this performance. The present study tested the otolithic contribution to spatial working and reference memory by evaluating the performance of otoconia-deficient tilted mice on a radial arm maze and a Barnes maze. One radial arm maze task provided both intramaze and extramaze cues, whereas the other task provided only extramaze cues. The Barnes maze task provided only extramaze cues. On the radial arm maze, tilted mice performed similar to control mice when intramaze cues were available, but made more working and reference memory errors than control mice when only extramaze cues were available. On the Barnes maze task, control and tilted mice showed similar latency, distance, and errors during acquisition training. On the subsequent probe trial, both groups spent the greatest percentage of time in the goal quadrant, indicating they were able to use extramaze cues to guide their search. Overall, these results suggest signals originating in the otolith organs contribute to spatial memory, but are not necessary for all aspects of spatial performance.
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