본 연구는 성인 스마트폰 중독 경향군의 인지 및 주의 과정에서 나타나는 억제기제의 결함을 확인하였다. 실험 1에서는 인지 과정 내 억제기제를 확인하기 위해 탐사재인 읽기 폭 과제를 실시하였다. 추가적으로 스마트폰과 관련된/관련되지 않은 단어로 구성된 문장세트를 실험자극으로 사용하여 스마트폰 중독에서 나타나는 반응 특성이 있는지 알아보았다. 실험 결과 첫째, 스마트폰 중독 경향군은 불필요한 정보에 대한 선택적 억제가 나타나지 않았다. 둘째, 스마트폰 중독 경향군은 통제군과 비교하여 스마트폰과 관련되지 않은 정보를 처리할 때 반응시간이 더 길었으나 스마트폰과 관련된 정보를 처리할 때는 반응시간에서 유의미한 차이를 보이지 않았다. 이와 같은 결과는 스마트폰 중독 경향군이 작업기억 집행기능의 효율성, 즉 불필요한 정보에 대한 선택적 억제에 어려움이 있고 통제집단과 구분되는 반응 특성이 있음을 보여준다. 실험 2에서는 자동적 주의 과정 내 억제기제를 확인하기 위해 회귀억제 과제를 실시하였다. 실험 결과, 스마트폰 중독 경향군은 통제군에 비해 적은 회귀억제량을 보였다. 두 실험 결과를 종합하면 스마트폰 중독 경향군은 인지 및 주의 과정 내에서 억제기제 활성화의 저하를 보였다. 본 연구의 결과는 통제군과 구별되는 스마트폰 중독 경향군의 특성을 이해하는데 유용하게 이용될 수 있고 이를 바탕으로 스마트폰 중독을 진단하는 지표들을 마련하는데 도움이 될 것으로 생각된다.
The aim of this study was to examine the deficit of inhibitory mechanism in cognition and attention process in adults with smartphone addiction tendency. In experiment 1, probe recognition reading span task was conducted to explore inhibition mechanism in cognition process. In addition to, investigate respond characteristic of adults with smartphone addiction tendency, sets of sentences were used as experiment stimuli. The sentences were composed of smartphone related or unrelated words. The result of experiment 1, first, smartphone addiction tendency group did not show selective inhibition for irrelevant information. Second, smartphone addiction tendency group took longer response time when processing smartphone-unrelated information compared to the control group. However, these groups did not show a significant difference in the response when they processe smartphone-related information. These results suggested that smartphone addiction tendency had difficulties in inhibition ability for irrelevant information. It means that efficiency of executive function of working memory is degraded. And also, it showed that there was distinct respond characteristic of smartphone addiction tendency in comparison with control group. In Experiment 2, inhibition of return task was conducted to explore inhibition mechanism in attention process. The result of experiment 2, smartphone addiction tendency group showed less inhibition of return compared to control group. In summary, all of these results suggested that adults with smartphone addiction tendency had decreased inhibition mechanism in cognition and attention process. The result of the present study could be use in understanding the characteristic of smartphone addiction and it will be useful to make a diagnosis of smartphone addiction.
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