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Automatic and Controlled Inhibitory Processes in Patients with Mild Alzheimer's Disease

Abstract

Impairment of inhibitory mechanisms in patients with Alzheimer's disease (AD) remains controversial. Recent reviews regarding inhibitory functioning in AD have suggested that automatic inhibitory processes are intact while controlled inhibitory processes are impaired in patients with AD. The author examined the inhibition of return(i.e., automatically evoked inhibition; IOR) and flanker task(i.e., intentionally evoked inhibition) in a group of 15 patients with mild AD and 17 age-matched healthy controls (HC). Patients with mild AD exhibited significant IOR effects. A planned comparison revealed that unlike the HC, who exhibited significant IOR effects at all stimulus onset asynchrony(SOA), patients with mild AD exhibited significant IOR effects only at 800ms SOA. Further, the HC and patients with mild AD demonstrated significant inhibition with respect to the flanker task. These findings suggested that in the early stages of AD, automatic inhibitory processes may be intact whereas controlled inhibitory processes may be impaired. Finally, limitations of this study and suggestions for future studies were discussed.

keywords
Alzheimer’s disease, automatic inhibitory processes, controlled inhibitory processes, inhibition of return, flanker task, 알츠하이머병, 자동억제처리, 통제억제처리, 회귀억제, 측면자극 과제

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