超姿勢任務意指個體必須在維持穩定姿勢的狀態下執行其他任務，在動態環境下保持平衡或增加超姿勢任務之負荷時，可能造成姿勢不穩定甚至是動暈；行動裝置日益普及，本研究基於姿勢不穩定理論，設計三個實驗，旨在探究個體在模擬交通運輸情境，操作智慧型手機，以手寫輸入法執行任務時之姿勢控制與動暈現象；實驗一，12名參與者在動態車廂模擬情境下進行以下任務：保持平衡以及使用慣用手與非慣用手執行漢字楷書書寫任務；實驗二，48名參與者被隨機分派至由操作手與兩認知負荷水準所交雜而成的四個組別中，執行草書臨寫任務；實驗三，48名參與者被隨機分派至由操作手與字形繁簡所組構之四個組別當中，執行草書描紅任務；實驗前、後，參與者必須填寫虛擬情境動暈問卷，在實驗試作中則使用磁力追蹤儀收集參與者的肢段位置資料，以計算身體擺動與標記點間的交叉相關係數；研究結果顯示，執行各種超姿勢任務時，個體展現不同的動作型式；本研究的結論是操作手、認知負荷與動作複雜度因子並非造成動暈的主因，但會影響身體的姿勢控制，動暈者與非動暈者的姿勢控制略有不同。

Supra-postural task implies that the organism has to perform other tasks while maintaining a stable posture. Keeping balance in a dynamical environment or increasing load to supra-postural tasks may induce posture instability and even motion sickness. Mobile devices become more and more popular nowadays. In this study, based on the postural instability theory, three experiments were designed. The aim of this study was to find out the posture control and motion sickness phenomenon while individuals used the handwriting input method to perform various tasks with a smartphone under the imitated transportation conditions. In experiment 1, twelve participants had to perform the following tasks under dynamic carriage simulations: Keeping balance and performing a Chinses standard writing task with dominant and non-dominant hands. In experiment 2, forty-eight participants were randomly assigned into four groups that were constructed by writing hands and two levels of cognition load to perform the cursive-writing copying tasks. For experiment 3, forty-eight participants were randomly assigned to the four groups that were constituted by the writing hands and complexity of the characters to perform the cursive writing copy task (covering the strokes of the sample characters). Participants have to fill out the simulator sickness questionnaire (SSQ) before and after the experiment. The position data of the specific segments were collected by the magnetic tracking system during the trials to calculate the body sway and the cross-correlation coefficients among the target markers. Results revealed that different movement patterns were found in various supra-postural tasks. The conclusions of the current study were that writing hand, cognition load and movement complexity were not the main reason that caused motion sickness. However, these factors affected the control of body posture. Few differences were found in posture control between people who were motion sickness and who were not.

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