Sex differences in exploratory behavior of rats successfully performing the object-in-place recognition memory test

IF 2.6 3区 心理学 Q2 BEHAVIORAL SCIENCES
Dan L. McElroy, John G. Howland
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引用次数: 0

Abstract

Male and female rodents display unique search strategies when exploring new and familiar environments. Sex differences are well-documented in the literature and may be observed in tasks that rely on spontaneous exploration (e.g., recognition memory tests). Therefore, we assessed patterns of male and female rat behavior in the object-in-place (OiP) test, a common recognition memory paradigm involving object-location associations. Twelve male and 12 female adult Long Evans rats were tested four times in the 1-h OiP test and exploratory behaviors were compared during habituation, sample, and test phases. Results revealed that females moved faster and farther than males, showed increased immobility frequency and reduced immobility duration, reduced outer zone mobility duration, and increased inner zone entrances, compared to males during habituations. During sample phases, female rats moved faster than males, displayed reduced immobility frequency in the inner zone, and demonstrated consistent distance travelled across repeated sessions; conversely, male rats moved less in later sessions and exhibited increased mobility frequency in the outer zone. Analyses comparing test phase behavior revealed females continued to move faster than males; however, no other sex differences were observed. These findings are consistent with previous literature highlighting unique sex differences in explorative behaviors during recognition testing. Sex differences in locomotion and mobility state behaviors may be more indicative of individual motivation and search strategy between the sexes and less indicative of recognition memory.
成功完成原地物体识别记忆测试的大鼠探索行为的性别差异
雄性和雌性啮齿动物在探索新环境和熟悉环境时会表现出独特的搜索策略。性别差异在文献中有大量记载,在依赖自发探索的任务(如识别记忆测试)中也可能观察到性别差异。因此,我们评估了雌雄大鼠在 "就地取物"(OiP)测试中的行为模式。我们对 12 只雄性和 12 只雌性成年长伊文大鼠进行了四次为期 1 小时的 OiP 测试,并比较了它们在习惯、取样和测试阶段的探索行为。结果显示,与雄性大鼠相比,雌性大鼠在习惯阶段的移动速度更快、距离更远,固定频率增加、固定时间缩短,外区移动时间缩短、内区进入增加。在样本阶段,雌性大鼠比雄性大鼠移动得更快,在内侧区域的不动频率降低,并且在重复训练中表现出一致的移动距离;相反,雄性大鼠在后期训练中移动得较少,并且在外侧区域表现出更高的移动频率。对测试阶段行为的比较分析表明,雌性大鼠的移动速度仍然快于雄性大鼠,但没有观察到其他性别差异。这些发现与之前的文献一致,都强调了识别测试期间探索行为的独特性别差异。运动和移动状态行为的性别差异可能更多地表现在性别间的个体动机和搜索策略上,而不是识别记忆上。
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来源期刊
Behavioural Brain Research
Behavioural Brain Research 医学-行为科学
CiteScore
5.60
自引率
0.00%
发文量
383
审稿时长
61 days
期刊介绍: Behavioural Brain Research is an international, interdisciplinary journal dedicated to the publication of articles in the field of behavioural neuroscience, broadly defined. Contributions from the entire range of disciplines that comprise the neurosciences, behavioural sciences or cognitive sciences are appropriate, as long as the goal is to delineate the neural mechanisms underlying behaviour. Thus, studies may range from neurophysiological, neuroanatomical, neurochemical or neuropharmacological analysis of brain-behaviour relations, including the use of molecular genetic or behavioural genetic approaches, to studies that involve the use of brain imaging techniques, to neuroethological studies. Reports of original research, of major methodological advances, or of novel conceptual approaches are all encouraged. The journal will also consider critical reviews on selected topics.
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