Faster aging of executive function:Evidence from a paired-task comparison

본 연구의 목적은 관리기능(executive function)이 다른 인지기능보다 빨리 노화한다는 가설을 검증하는 것이었다. 이를 위해 연령이 16-69세인 736명의 건강한 일반인에게 관리기능 의존도의 강약에 따라 구성한 세 개의 짝과제를 실시하였다. 세 짝과제는 스트룹간섭시행과 단순시행, 단어유창성과 상식, 도안유창성과 빠진곳찾기였다. 분석으로는 연령이 독립변인이고 교육년수와 성별이 공변인인 반복측정 공변량분석을 짝과제별로 시행하였다. 결과를 보면, 세 짝과제 모두에서 짝과제와 연령 간의 상호작용이 통계적으로 유의하였다. 이 상호작용은 연령에 따른 저하가 관리기능 의존도가 높은 과제에서 더 빠름을 나타내었다. 그러므로 스트룹단순시행보다는 간섭시행, 상식보다는 단어유창성, 빠진곳찾기보다는 도안유창성에서 연령에 따른 저하가 더 빨랐다. 오류반응을 보면 스트룹검사의 간섭오류, 단어유창성의 반복반응, 도안유창성의 반복반응이 연령에 따라 유의하게 증가하였다. 이 결과들은 관리기능이 차별적으로 빨리 노화한다는 가설을 지지한다. 선행 연구들은 관리기능의 성숙이 다른 인지기능에 비해 늦은 연령까지 계속됨을 보고하였다. 이런 보고와 본 연구의 결과를 종합하면, “Last in, first out”, 즉 가장 늦게 성숙한 인지기능이 가장 먼저 쇠퇴한다고 결론할 수 있다.

keywords: executive function, aging, frontal lobe, paired-task, 관리기능, 노화, 전두엽, 짝과제

Abstract

This study is conducted to verify the hypothesis stating the executive function of a human brain loses its efficiency relatively faster than other cognitive functions in accordance with the body age. In this analysis, 736 healthy participants between age 16 to 69 were recruited and three paired tasks were performed depending the subjects' independency level of their executive functions. The three paired tasks were Stroop Interference Trial vs. Stroop Simple Trial, Verbal Fluency vs. Information, and Design Fluency vs. Picture Completion. The data for each paired task were subject to analysis of covariance in which “age” was the independent variable and “years of education” and “gender” were two covariants. The result shows that there is a statistically significant relationship between the paired tasks and the age of participants. In this interaction, the decreasing rate of participant age-considered performance is greater in the tasks demanding a higher level of executive function. Thus, the age-related performance decline was faster in Stroop Interference Trial relative to Stroop Simple Trial, Verbal Fluency relative to Information, and Design Fluency relative to Picture Completion. In terms of erroneous responses, it showed age-related increases in errors on Stroop Interference Trial and perseverative responses in Verbal and Design Fluency. These results are consistent with the executive decline hypothesis of cognitive aging. The previous studies have provided the evidence that the executive function matures more slowly than nonexecutive cognitive functions. Considering this evidence, this study results lead to a conclusion that the cognitive functions that mature slowly are also age faster, or more succinctly expressed, it is a “Last in, first out”.

keywords: executive function, aging, frontal lobe, paired-task, 관리기능, 노화, 전두엽, 짝과제

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논문 상세

Vol.34 No.2

관리기능(executive function)의 빠른 노화: 짝과제를 사용한 검증

Faster aging of executive function:Evidence from a paired-task comparison

초록

Abstract

참고문헌

한국심리학회지: 일반