Abstract
Event related fMRI was used to investigate age-related changes in BOLD activity during the execution of right hand finger movements in internally or externally guided tasks. All of the younger adults exhibited typical (positive) BOLD responses in supplementary motor areas (SMA) bilaterally, and in the left sensorimotor cortex. Negative BOLD responses were found, however, in the right sensorimotor cortex of the younger adults. In contrast, all but one of the older adults had positive BOLD responses in SMA and sensorimotor cortex of both hemispheres. Across both tasks, older adults showed increased activity (relative to younger adults) in right ventrolateral premotor and medial premotor areas, but more so during the internally guided task. Overall, these results suggest age-related changes in motor control. The younger adults’ hemispheric asymmetry and the lack thereof in older adults suggest a fundamental change in interhemispheric communication as part of the normal aging process.
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Acknowledgments
This research was supported by Center of Excellence grant # F2182C and Research Career Scientist Award # B3470S from the Department of Veterans Affairs Rehabilitation Research and Development Service, and by grant # M47 from the Evelyn F. McKnight Brain Research Grant Program at the University of Florida.
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Appendix
Individual estimated hemodynamic response functions from which the group analyses above were derived are shown in Figs. 5, 6, 7, 8, 9, 10, 11 and 12. Each figure shows response magnitude as relative signal change (in percent) because the six curves in each figure, either for the group of young participants or the group of older participants, have been displaced vertically for clarity. Vertical displacements were 0, 1, 2, 3, 4, or 5 percent. Each figure’s abscissa shows deconvolution lag (in TR or image number) relative to the task event with which the deconvolution was time-locked. Because TR = 1.7 sec, the hemodynamic responses are shown evolving over a 25.5 sec time period. A given symbol shape corresponds to a given subject number across the figures (but note, for example, that O-1 and Y-1 belong to different age groups and are represented on different figures). Each plotted point shows the mean +/- standard deviation of signals obtained from the five maximally significant voxels within primary sensorimotor cortex (M1S1). Different figures represent younger versus older participant group, left versus right hemisphere’s M1S1, and internally versus externally guided task, as labeled on each figure.
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McGregor, K.M., Craggs, J.G., Benjamin, M.L. et al. Age-Related Changes in Motor Control During Unimanual Movements. Brain Imaging and Behavior 3, 317–331 (2009). https://doi.org/10.1007/s11682-009-9074-3
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DOI: https://doi.org/10.1007/s11682-009-9074-3