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The role of working memory and attentional disengagement on inhibitory control: effects of aging and Alzheimer's disease

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Abstract

Patients with Alzheimer's disease have an impairment of inhibitory control for reasons that are currently unclear. Using an eye-tracking task (the gap-overlap paradigm), we examined whether the uncorrected errors relate to the task of attentional disengagement in preparation for action. Alternatively, the difficulty in correcting for errors may be caused by the working memory representation of the task. A major aim of this study was to distinguish between the effects of healthy aging and neurodegenerative disease on the voluntary control of saccadic eye movements. Using the antisaccade task (AST) and pro-saccade task (PST) with the ‘gap’ and ‘overlap’ procedures, we obtained detailed eye-tracking measures in patients, with 18 patients with probable Alzheimer's disease, 25 patients with Parkinson's disease and 17 healthy young and 18 old participants. Uncorrected errors in the AST were selectively increased in Alzheimer's disease, but not in Parkinson's disease compared to the control groups. These uncorrected errors were strongly correlated with spatial working memory. There was an increase in the saccade reaction times to targets that were presented simultaneously with the fixation stimulus, compared to the removal of fixation. This ‘gap’ effect (i.e. overlap–gap) saccade reaction time was elevated in the older groups compared to young group, which yielded a strong effect of aging and no specific effect of neurodegenerative disease. Healthy aging, rather than neurodegenerative disease, accounted for the increase in the saccade reaction times to the target that are presented simultaneously with a fixation stimulus. These results suggest that the impairment of inhibitory control in the AST may provide a convenient and putative mark of working memory dysfunction in Alzheimer's disease.

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Acknowledgments

This work was funded by the Lytham League of Friends, the Bial Foundation and The Sir John Fisher Foundation. We are grateful to T. Renvoize, J. Patel, A. Suriya, S. Tetley and the late Professor D. Mitchell for help with original data collection and to Ms. Lilith Kostandian for her help with processing of the PD data. We are grateful to two anonymous referees for their helpful comments on an earlier draft.

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Correspondence to Trevor J. Crawford.

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Crawford, T.J., Higham, S., Mayes, J. et al. The role of working memory and attentional disengagement on inhibitory control: effects of aging and Alzheimer's disease. AGE 35, 1637–1650 (2013). https://doi.org/10.1007/s11357-012-9466-y

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  • DOI: https://doi.org/10.1007/s11357-012-9466-y

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