ラテラリティ現象の質問紙法による研究 : 主として利き足の定義に関して(第2報)

抄録

A questionnaire of laterality, which contains seventy items and other four questions that ask the consciousness of laterality of hand, foot, eye, and ear, was given to 123 female students. They were asked to answer on a five point scale. The answers were converted into a three point scale by summing up scales 1 and 2 or scales 4 and 5. Seven items in which more than a third of the subjects answered as impossible or unidentified were omitted in the analysis of this study. Twenty eight items asking hand preference were divided into four categories and tabulated respectively. One of the categories is the movement by one hand. (ex. throwing ball). The items in this category were chosen to identify the handedness. The other three categories contain the items of the movement with both hands. One category is the movement in which the dominant hand (functional hand) is clearly identified. Another is the movement in which the dominant hand is not so clear (ex. the hand which moves forward when newspaper is torn with both hands). The remaining category is the static movement (ex. the upper thumb when hands are folded). Twenty one items asking foot preference were divided into six Categories. These were jumping, starting of running, the movement from static state (ex.leg used for first step), functional foot (ex. writing letters by foot), static movement, and the complicated movement with feet and hands (ex. the foot put on the shoulder of shovel when a hole is dog in the earth). The other items were categorized into three clases, i.e., trunk turining, movement with eyes, and movement with ears. The main purpose of this study was to identify the footendess for the exertion of muscle strength and the footedness for the functional use. In Group H, where the functional foot was asked, many subjects answered the use of right hand for the functional use. It was proven that most subjects use the right foot in functional use as was hypothesized in the author's previous study. The dominant foot for the exertion of muscle strength was determined by the take-off foot for the broad jump and the high jump as was mentioned in the previous study. More than eighty per cent of subjects whose dominant foot for the exertion could be determined answered the same foot when the take-off foot of the hurdle run was asked. This justified the definition of dominant foot for the exertion of muscle strength mentioned above. There was no direct relationship between both footednesses. The results of the current questionnaire, when outcomes of the items on foot were excluded, were nearly the same as was reported in the previous study.