(Download) "Effects of Mild Cognitive Impairment on Visual Word Recognition" by Aryn Lyn Harrison Bush * eBook PDF Kindle ePub Free
eBook details
- Title: Effects of Mild Cognitive Impairment on Visual Word Recognition
- Author : Aryn Lyn Harrison Bush
- Release Date : January 19, 2013
- Genre: Medical,Books,Professional & Technical,
- Pages : * pages
- Size : 9997 KB
Description
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.
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