멈춤 신호 과제의 타당화 연구 = Validation of Stop-Signal Task

다국어 초록 (Multilingual Abstract)

The purpose of present study was to develop the Stop-Signal Task and to investigate its reliability and validity. Stop-Signal Task provides a measure of the efficiency of response inhibition deficit. Adults with ADHD tendencies and the control group completed ADHD scales(current symptoms scales, childhood symptoms scale), and impulsivity scales. Then the two groups performed the Stop-Signal Task and the Continuous Performance Test. The results were as follows. First, SSRT positively correlated with adult ADHD scores, Barratt impulsivity scores, and Dickman impulsivity scores. Second, in the case of the Stop-Signal Task, Delay and GORT of the ADHD group were shorter than delay and GORT of the control one, and SSRT of the ADHD group was longer than that of the control one. In other words, adults with ADHD tendencies have response inhibition deficit compared with the control group. In contrast, on Continuous Performance Test(CPT), there was no difference between the ADHD group and the control one. Third, alternate-form reliability of the Stop-Signal Task was significantly moderate. In conclusions, Stop-Signal Task appears to be a highly reliable and valid measure to assess the efficiency of response inhibition. Finally, clinical implication and limitations of this study were discussed, and the suggestions for future study were also discussed.

국문 초록 (Abstract)

본 연구에서는 반응 억제 결함을 효과적으로 측정할 수 있는 멈춤 신호 과제를 개발하여 그 신뢰도와 타당도를 검증하였다. 성인 ADHD 고경향 집단과 저경향 통제 집단에게 ADHD 질문지와 충동성 질문지를 작성하게 한 후, 멈춤 신호 과제와 연속 수행 과제를 수행하게 하였다. 그 결과, 첫째, 멈춤 신호 과제의 SSRT는 성인 ADHD 점수, 바랫 충동성 점수 및 딕만 충동성 점수와 유의한 상관관계를 보였다. 둘째, 멈춤 신호 과제에서 성인 ADHD 고경향 집단의 SSRT는 저경향 통제 집단의 SSRT보다 더 길었다. 즉 ADHD 고경향 집단이 저경향 통제 집단보다 반응 억제를 잘 하지 못하였다. 한편 연속 수행 과제에서는 성인 ADHD 고경향 집단과 저경향 통제 집단 간에 유의한 차이가 없었다. 셋째, 멈춤 신호 과제의 동형 신뢰도 검증을 실시하였는데, 유의한 신뢰도 계수를 보였다. 이 결과는 멈춤 신호 과제가 반응 억제 결함을 측정하는 신뢰롭고 타당한 측정 도구임을 시사한다. 끝으로 본 연구의 임상적 의의와 제한점에 대해 논의하였다.

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