本研究以追隨眼動法（pursuit movement）進行Müller-Lyer 錯視圖形凝視軌跡觀察與分析，以瞭解人類如何觀看錯視圖形以及錯視圖形影響人視覺運動的程度。在過去的錯視研究中，多數為心理科學領域且較多知覺與行為的相關研究，較少探究人觀看錯視圖形時之知覺歷程與視線軌跡變化的現象及原因。本研究針對人的知覺（perception）與視線軌跡（scanpath）之範疇內，進行視覺在觀看Müller-Lyer 錯視圖形時視覺追隨眼動的軌跡變化，以瞭解錯覺的形成是否會影響視覺的追隨眼動。因此研究目的包括：（1）紀錄並觀察在不同方向的矢羽線，視覺
追隨眼動之軌跡分佈的長短差異。（2）分析人在視覺控制上，知覺是否受到Müller-Lyer 錯視
圖形的影響，而使視覺追隨運動產生改變。實驗採用受測者內設計，受測者觀看追隨在Müller-Lyer 圖形上觀看追隨移動的紅點目標動態影片，透過眼動儀（View Point PC 60
eyetracker）及SuperLab 實驗控制軟體等設備，記錄並分析受試者觀看實驗圖形中不同方向之矢羽線的視線軌跡差異。實驗分析方法將眼動資料數據以中位數及平均數的概念計算分析，比較不同實驗圖形變化時，受試者視線軌跡分佈的差異。研究發現如下：（1）在觀看相同長度的直線時，矢羽線向外的錯視圖形，其追隨眼動的視線軌跡分佈較長，而矢羽線朝內的圖形，視線軌跡則分佈較短。（2）視覺受到Müller-Lyer錯視圖形所形成的知覺影響了視覺追隨運動，而使得眼球的常態運動產生改變，進而產生視軌跡長短分佈的差異。初步推論在觀看長度的錯視圖形時，人在視覺的控制上和行動（action）與知覺分離的現象不同，視覺與知覺是相互影響形成了錯視，進而影響了眼球追隨運動。

The dissociations between visual perception and visual guided action have long been suggested (Goodale & Haffenden, 1998). Studies showed that the saccadic eye movements were guided by real physical stimuli rather than by the perceived visual illusions. In the present research, we investigated which guides the pursuit eye movements, physical stimuli or visual illusions, for moving targets along Müller-Lyer illusory line A typical Müller-Lyer illusory pattern has two figures each with arrow tips in both ends, one with both arrows pointing in, and the other with both ends pointing out.Viewers (including the observers of the present research) always claim that the line with outward pointing arrows perceived longer than the line with inward arrows.A video eye tracker (ViewPoint PC60) was used to record the eye movements during observers pursuing a target which was composed by a red dot moving along the Müller-Lyer illusion lines with either outward or inward pointing arrows, and a controlled line without any arrows. All three lines had exactly the same length. The results showed hat the recorded scanning paths of pursuing a target moving along the line with outward pointing arrows are longer than those of pursuing a target moving along the line with inward pointing arrows. The results show that the visual illusion guides the pursuit eye movements in the case, and suggest that pursuit eye movements may be guided by the WHAT rather than by the HOW visual information processing streams.