한국 대학생들의 손잡이(Handedness) 형태 유형과 손잡이 평가항목 상관성 분석
The Type of Handedness and Correlation Analysis of Handedness Assessment Items on University Students in Korea
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초록
왼손잡이와 오른손잡이는 언어중추를 포함한 대뇌조직화의 양상이 서로 다르고, 여러 지각 인지과제들에 서 다른 수행수준을 보이며, 사회적, 문화적 영향을 받는 것으로 알려져 있다. 그러나, 같은 평가도구를 사용할 지 라도 한국인에서 민감하게 반응하는 항목들은 다를 수 있으므로, 손잡이의 유형을 평가해 보고, 평가도구 항목 중 한국인들에게 민감하게 반응하는 항목을 선별하여 손잡이 유형 판별에 적용하고자 본 연구를 시도하였다. 연구대상은 대전∙충남지역의 대학생 1,063명이었으며, 연구도구는 Oldfield Test, Annett Questionnaire, Croviz- Zener Questionnaire의 손잡이 검사 20문항을 포함한 31문항이었고, 자료분석은 빈도분석, 신뢰도분석, t-test, Pearson correlation analysis를 하였다. 대상자의 11.5%가 후천적으로 손잡이가 바뀌었으며, 그 중 왼손잡이가 오른손잡이나 양손잡이로 바뀐 경우가 62.7%로 나타났고, 바뀐 시기는 만 6세 이상에서 만 8세 미만이 30.5%로 가장 많았다. 부모와 자녀세대간의 손잡 이 유형은 통계적으로 유의하게 차이가 있었다(부자간 t=-5.227, p⁄0.001, 모자간 t=-4.515, p⁄0.001). 손잡이 검사에 의한 평가는, 왼손잡이가 6.0%로 나타나 과거 비율 4.8%(Kang 1994)보다 증가했다. 평가도구에서 전체항 목 평균과 가장 상관관계가 높게 나타난 순위는, 못을 박을 때 망치를 드는 손(r=0.892, p⁄0.001), 칼을 사용하는 손(r=0.871), 가위질하는 손(r=0.847)이었으며, 글씨를 쓸 때 사용하는 손은 상관관계가 가장 낮은 것으로 나타났 다(r=0.563). 이상의 결과로 볼 때, 시대적 흐름과 사회적 개방화에 따라 우리나라도 왼손잡이가 증가추세에 있으나 서양에 비해서는 여전히 낮은 비율이며, 한국인의 손잡이를 평가할 때는 상관관계순위가 높은 순서대로 적용해 판단하는 것이 합리적이라 사료된다. 따라서, 못을 박을 때 왼손에 망치를 들고, 도마 위에서 야채나 고기를 썰 때 왼손에 칼을 쥐고, 왼손으로 가위질을 하고, 성냥불을 켜며, 또한 공을 던지는 사람은, 글씨를 쓰고 그림을 그릴 때 오른손 을 사용하더라도 왼손잡이로 평가할 수 있다.
Abstract
The left handers are different from the right handers in brain development aspects and various perceptive or cognitive performance. There are known the types of handedness are under social and cultural influence. Moreover, the different races or countries show the different sensitivity to each item in assessment tool. The aim of the this study is to assess type of handedness and choose the best item of assessment tool for Korean. The subjects of this study were 1,063 persons. Data were collected by total 31 items including 20 items through reconstruction of the Oldfield Test, Annett Questionnaire and Croviz-Zener Questionnaire. The reliability of tool is Cronbach’s α=0.948. The data were analyzed through frequency, reliability analysis, t-test, and Pearson’s Correlation analysis by SPSS win 14.0. The 11.5% of total subjects was changed handedness through experience, 62.7% of these subjects changed from left handedness to right or mixed handedness, and 30.5% of these subjects changed handedness from sixth years old or more to below eighth years old. The mean of handedness score between parents and offspring revealed statistically significant difference (father and offspring t=-5.227, p⁄0.001, mother and offspring t=-4.515, p⁄0.001). The left handedness increased from the past ratio 4.8% (Kang 1994) to the present study 6.0% (64 persons) by handedness assessment tool. The mean of total items showed significant positive correlations with hammering a nail (r=0.892, p⁄0.001), gripping knife (r=0.871), using scissors (r=0.847), and writing exhibited the lowest correlation (r=0.563). These results demonstrate that left handers in Korea were increased than the results by previous researchers, and the best items for distinguishing the left handers from the right handers were the hand hammering a nail, gripping knife, using scissors, lighting a match, and throwing small ball.
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