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    Factors contributing to sexually dimorphic performance on the Morris water task.

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    Author
    Warren, Stacey Gayle.
    Issue Date
    1993
    Keywords
    Dissertations, Academic.
    Neurosciences.
    Committee Chair
    Nadel, Lynn
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Sex differences in place learning on the Morris water task were examined in this dissertation. Adult Long Evans hooded rats were tested on this task to determine whether there are sex differences on this task, whether males and females use different strategies to solve the task, whether they attend to different aspects of the environment for navigation, as has been previously hypothesized, and whether they both use the fornix (hippocampal formation) for navigation on this task. Exploratory behaviors were also examined for both sexes to establish whether there was evidence that they engage in different activities while forming a cognitive map. Lastly, the role of the female estrous cycle on water maze performance was examined. Results indicated that males and females are equally impaired following fornix lesions, and there is no evidence that they use different strategies to solve the task or attend to different aspects of the environment. There was an overall sex difference in performance on the task, with males solving the task faster than females, and searching the target area at a much higher rate than females. There was some preliminary evidence of sex differences in exploration which predicted place learning in the water maze. Lastly, the estrous cycle did significantly effect the female's performance. Females in the high estrogen period were generally less efficient on the task than those in the low estrogen phase. This was interpreted to reflect a difference in motivation across the days of the cycle, rather than a difference in ability to perform the task.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Psychology
    Graduate College
    Degree Grantor
    University of Arizona
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    Dissertations

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