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Environmental enrichment enhances spatial cognition in rats by reducing thigmotaxis (wall hugging) during testing

机译:通过减少测试过程中的趋轴性(壁抱),环境富集增强了大鼠的空间认知

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摘要

Rats, Rattus norvegicus, housed with 'environmental enrichment' do better in tests of spatial cognition than rats housed in barren cages. The leading hypothesis is that exposure to 'social and inanimate complexity' leads to better cognitive-processing abilities, which directly enhances performance in a spatial task. However, enrichment is associated with reduced stress responses and anxiety in novel or acutely stressful situations (cognitive tasks are typically both). Therefore, a plausible alternative hypothesis is that experience of enrichment indirectly enhances performance by reducing a rat's anxiety levels during cognitive testing. We found that, irrespective of sex, enriched rats outperformed barren-housed rats in the Morris water maze. However, after accounting for the effects of thigmotaxis (a behavioural anxiety measure during testing), there was no significant difference in performance between enriched and barren-housed rats. Enriched rats were simply less thigmotactic and this indirectly improved their performance. This was true for both males and females. We conclude that enrichment reduces anxiety outside the home cage, in a cognitive test situation, and, subsequently, the cognitive benefits of enrichment occur because enriched animals are less anxious during cognitive testing.
机译:在空间认知测试中,“环境富集”的大鼠褐家鼠比在贫瘠笼子中的大鼠表现更好。首要的假设是,暴露于“社会和无生命的复杂性”会导致更好的认知处理能力,从而直接提高空间任务的表现。然而,在新的或急性应激的情况下(认知任务通常兼具),充实会降低应激反应和焦虑。因此,一个合理的替代假设是,通过在认知测试过程中减少大鼠的焦虑水平,丰富的经历可以间接提高性能。我们发现,无论性别如何,富人老鼠在莫里斯水迷宫中的表现都优于贫瘠的老鼠。但是,在考虑了趋轴性的影响(测试过程中的行为焦虑量度)后,富营养和贫瘠大鼠之间的性能没有显着差异。富集的大鼠的拟趋力较小,这间接改善了它们的表现。男性和女性都是如此。我们得出的结论是,在认知测试的情况下,充实可以减少家笼之外的焦虑感,并且随后出现充实的认知优势,因为充实的动物在认知测试过程中的焦虑程度降低了。

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