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Effects of Mild Cognitive Impairment on Visual Word Recognition: A Longitudinal Investigation

Harrison Bush, Aryn Lyn
http://rave.ohiolink.edu/etdc/view?acc_num=akron1144771075

Abstract Details

2006, Doctor of Philosophy, University of Akron, Psychology-Applied Cognitive Aging.
The present study was a longitudinal extension of Bush and colleagues’ (in press) examination of the influence of amnestic mild cognitive impairment (MCI) on visual word recognition using a standard lexical decision task. The performances of cognitively healthy older adults, high functioning amnestic MCI (HMCI) patients, and low functioning amnestic MCI (LMCI) patients were compared. Results revealed that the LMCI group performed significantly worse than the unimpaired group on all Rey Auditory Verbal Learning Test measures except for the working memory span measure; HMCI performance, however, more closely resembled healthy adult performance on all portions except delayed recall. Consistent with numerous studies that have reported a mixed-case disadvantage in healthy older adults, lexical decision results revealed that the unimpaired group exhibited a mixed-case disadvantage at Time 1 and Time 2. The LMCI group exhibited a mixed-case disadvantage at Time 1, but this effect was attenuated at Time 2. Further, the LMCI group performed significantly worse when processing mixed-hue stimuli at Time 2, whereas the unimpaired group did not exhibit hue-processing deficits at Time 1 or Time 2. It appears as though LMCI patients suffer from both holistic and analytic processing deficits, although the holistic deficit is more pronounced. Results are discussed with regard to the hybrid model of visual word recognition proposed by Allen, Wallace, and Weber (1995) that attempts to merge cognitive (behavioral) and neuroscientific visual processing frameworks.
Philip Allen (Advisor)
116 p.
Psychology, Cognitive
mild cognitive impairment; amnestic mild cognitive impairment; Alzheimer's disease; visual word recognition; visual processing; Parallel Input Serial Analysis (PISA) model; hybrid model of word recognition

Recommended Citations

Citations

  • Harrison Bush, A. L. (2006). Effects of Mild Cognitive Impairment on Visual Word Recognition: A Longitudinal Investigation [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1144771075

    APA Style (7th edition)

  • Harrison Bush, Aryn. Effects of Mild Cognitive Impairment on Visual Word Recognition: A Longitudinal Investigation. 2006. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1144771075.

    MLA Style (8th edition)

  • Harrison Bush, Aryn. "Effects of Mild Cognitive Impairment on Visual Word Recognition: A Longitudinal Investigation." Doctoral dissertation, University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1144771075

    Chicago Manual of Style (17th edition)

akron1144771075
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© 2006, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.