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- W2049214466 abstract "Cognitive aging has been associated with loss of myelin in late myelinating fibers, and the “white-matter hypothesis” of aging predicts that this loss is associated with reduced processing efficacy. In a study of older adults we expected to find a correlation between performance in a dichotic listening task (DL) and diffusion tensor imaging (DTI) measures of the white matter (WM) microstructure in corpus callosum (cc). The anterior part of cc, the genu, (gcc) has been associated with attentional processes, and is expected to be significantly correlated with DL measures of processing efficacy. Seventy participants (age 45 to 75 yrs.) were included. The DL task was used to measure processing efficacy. Diffusion tensor imaging was performed on a 1.5 T scanner. For postprocessing and calculation of fractional anisotropi (FA), we used DTI-Studio and MIPAV (cf. Figure 1). One way ANOVAs showed significant effects of age (F = 5.98, df = 2, p = .004) and gender (F = 6.46, df = 1, p = .013) in the forced left (FL) attention condition. The effect of age on FA values were non-significant, but gender explained a significant proportion of the variance in the gcc (p = .014). Overall, there were no statistically significant correlations between the measures of processing efficacy and the mean FA measures in gcc. However, there were significant gender differences. A higher number of females (31%) than males (13%) showed a left ear dominance in the non-forced DL condition, and moreover, in the same condition females showed a statistically significant correlation between degree of lateralized ear response and FA values in the gcc (r = .44, p = .002). Gender influenced the DL and FA measures in gcc as well as the interaction between the two. In females, the larger the lateralization of ear response, the higher the FA values in gcc. The present findings emphasize the importance of examining gender effects in studies of the association between cognitive function and DTI measures." @default.
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- W2049214466 date "2008-07-01" @default.
- W2049214466 modified "2023-09-27" @default.
- W2049214466 title "P3-155: White matter integrity and processing efficacy in older adults" @default.
- W2049214466 doi "https://doi.org/10.1016/j.jalz.2008.05.1721" @default.
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