本研究利用知覺複雜度來探討3-D環境下目標搜獲作業的表現，並且應用費茨法則探討在3-D環境下對移動行為的解釋程度。實驗一操弄干擾球數量，共分成三種不同干擾球數情況：1、3、7個。實驗二操弄干擾球顏色種類，共分為三種不同干擾球顏色種類：2、4、7種。實驗三操弄背景遮蔽程度，共分為三種不同遮蔽程度：無背景、中程度遮蔽、高程度遮蔽。研究結果顯示：不同干擾球數量及不同顏色種類主要影響到目標搜獲作業的反應時間。干擾球數增加至7個時的反應時間顯著長於其他情況，而顏色種類增加到4及7種時的反應時間長於只有2種顏色。整體研究結果顯示，作業困難度對移動時間有顯著的影響，當困難度增加移動時間也隨之增加。另外，在三度空間中，方向也會影響到移動時間。上後方的移動時間最長、下後方與上前方次之、下前方的移動時間最短。最後，當進行費茨法則的檢驗時發現，修正版的費茨法則對於3-D環境下移動時間與困難度之間的線性關係的解釋力較高，而此線性關係不會受到知覺複雜度的影響。

The current study investigates how perceptual complexity influences the target acquisition performance in 3-D display, and the application of Fitts’ law in 3-D environment. The total number of surrounding distracter spheres (1, 3, & 7), the variety of sphere colors (2, 4, & 7), and the degree of background clutters (non-clutter, mid, high) on the display were manipulated in Experiment 1, 2 and 3, respectively. The results show that the reaction time for the display with seven distracter spheres was significantly greater than that with three and one distracter spheres, and the reaction time for the display with seven and four colors of spheres was significantly greater than that with two colors. The movement time was mainly influenced by task difficulty and movement direction. The movement time increased along with the task difficulty and the different movement direction. The depth and the upper direction together have significantly influence on movement time. Modified Fitts’ law explains well in the linear relation between movement time and index of difficulty. The perceptual complexity has no impact on this linear relationship.

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