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본 연구는 경도 알츠하이머병 환자의 억제기제 손상을 밝히기 위해 실시하였다. 억제기제는 자동억제처리와 통제억제처리로 나누어 평가하였다. 자동억제처리는 회귀억제 과제를, 통제억제처리는 측면자극 과제를 사용하여 경도 알츠하이머병 환자 15명과 정상 노인 17명의 수행을 비교하였다. 그 결과, 경도 알츠하이머병 환자와 정상 노인은 단서-표적 제시간격(cue-target stimulus onset asynchronies: SOA) 수준에 관계없이 비단서 조건에 비해 단서 조건에서 반응시간이 느려지는 회귀억제 효과가 있었다. 그러나 계획비교 결과, 정상 노인은 세 조건(800ms, 1300ms, 1800ms)의 SOA에서 회귀억제 효과가 있었으나, 경도 알츠하이머병 환자는 800ms SOA에서만 회귀억제 효과가 나타나 회귀억제 효과가 지속되지 않았다. 이는 선행연구와 일치하지 않는 결과로, 치매 진행 정도에 따라 경증 이상에서는 자동억제처리 기능이 손상된다는 것을 시사한다. 측면자극과제에서는 경도 알츠하이머병 환자는 정상 노인에 비해 측면자극 과제에서 반응시간이 길었고, 오반응이 많았다. 매우 초기 단계의 알츠하이머병 환자는 반사적으로 일어나는 자동억제처리가 보존되지만, 치매가 진행될수록 경증 이상에서는 방해 자극을 무시하고, 표적 자극에 선택적으로 주의를 기울이는 데 필요한 통제억제처리 기능과 함께 자동억제처리도 손상된다는 것을 시사한다.
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.
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