Publication:

不同難度單向度拖曳工作對反應時間的影響

反應時間不單被定義為刺激輸入與動作輸出所持續的時間，也被視為訊息處理論的重要證據。愈複雜的動作伴隨著反應時間增加，常被用來解釋訊息處理論中的反應編序階段。透過費茲定律，工作困難度易於被量化，並用來評估人類動作系統的訊息處理能力。本實驗的目的在於探討單向度間斷拖曳工作下，不同難度指數對反應時間的影響。實驗參與者為6位男生和5位女生（19.2 ± 2.5歲）。本研究將動作難度目標寬度2公分與目標距離4、8、16、32公分的工作，分別為1、2、3、4的難度指數重新計算，結果為2.06、3.03、4.01、5.01 bits。實驗參與者被要求LED燈亮之後，在線性移動儀上進行間斷式拖曳動作（手臂的水平內移）至目標區。研究將肌電傳感器置於前三角肌肌腹位置，使用Biopac MP-150 system（1000Hz）搭配AcqKnowledge ver. 3.9.1來記錄及分析動作前時間（premotor time）、肌肉動作時間（motor time）、反應時間（reaction time）及動作時間（movement time）。實驗結果顯示，隨著難度指數增加，動作時間也跟著增加，F(3, 30) = 28.16，p< .05，但是動作前時間、肌肉動作時間及反應時間並未因難度指數而有所不同（p > .05）。研究顯示在單向度拖曳工作下，操弄四種不同難度指數，並不會造成訊息處理的變化。

Reaction time is not only defined as the duration of stimulus input and movement output, but is regarded as the important evidence of information processing model. The reaction time increasing with the complexity of the movement be increased is used to explain the stage of response programming which is the last stage of information processing. The task difficulty is easy to quantify in bits to assess the information processing capacity of the behavior of the human motor system through the analysis of Fitts’ law. The purpose of this study was to investigate the change of reaction time for different indexes of difficulty (ID) for discrete one dimension dragging task. Six boys and five girls (19.2 ± 2.5 years old) were recruited as the participants for this study. Participants were required to perform discrete dragging tasks (horizontal adduction at the shoulder) on a linear displacement meter (Gefran Model PK-M-0600-L) under the conditions of constant target width (2 cm) and four movement amplitudes (4 cm, 8 cm, 16 cm, and 32 cm that ID values were 2.06, 3.03, 4.01, and 5.01 bits respectively) after the trigger of LED light. A pre-amplifier EMG transducer with ground electrode was placed on the belly of anterior deltoid. The Biopac MP-100 system (1000 Hz) with AcqKnowledge ver. 3.9.1 was used to record and analyse the premotor time, motor time, reaction time, and movement time. The result showed movement time was increasing significantly following with the increase of ID values, F(3, 30) = 28.16, p < .05. But premotor time, motor time, and reaction time were no difference among four ID values (ps > .05). It indicated that the four ID values of one dimension dragging task that study manipulated did not lead to change of the information processing.