本研究旨在運用眼球追蹤方法探討大學生在線上搜尋任務的資訊焦慮與認知負荷之相關研究。研究樣本為48位大學生，其中男性為32位，女性為16位。本研究實驗是以「土石流成因」作為線上搜尋的任務問題，並以眼球追蹤系統記錄受試者在線上搜尋任務與閱讀不同網頁歷程中的眼球反應，並透過測量指標，如：總凝視時間、總閱讀時間、瞳孔水平直徑平均值、以及凝視率四項眼動指標，以及配合網路資訊焦慮量表、認知負荷自我評估問題以及線上搜尋任務成效所收集的資料進行交叉分析。研究結果顯示學生閱讀無關網頁所有的眼動指標都與線上搜尋焦慮呈正相關，且學生的搜尋任務得分和閱讀相關網頁內容時的瞳孔直徑呈顯著正相關，而與閱讀無關網頁內容時的凝視時間呈顯著負相關。此外，學生的先備知識和閱讀相關網頁時的瞳孔大小，對於任務得分具有正向預測力，亦即先備知識愈高以及在閱讀相關網頁的瞳孔愈大的學生，其任務得分也會愈高。值得注意的是，本研究發現學生的瞳孔大小可能可以作為在線上搜尋閱讀歷程中所投入的心智努力的程度指標之一。建議未來可以進一步探討學生在閱讀相關網頁內容的瞳孔直徑與任務表現之間的關係，確定瞳孔指標在線上搜尋閱讀歷程中所扮演的角色。

The purpose of this study was to employ eye-tracking techniques to explore the relationships between undergraduates’ search anxiety and cognitive load in online search tasks. Forty-eight university students（32 males, 16 females） participated in an experiment of problem-solving task to predict occurrences of landslide hazards after a web search. Eye-tracking measures including total fixation duration, total reading time, average pupil diameter, and fixation rate along with scores of the information anxiety rating scale, a self-reported cognitive load, and task performance were collected for data analyses. Results indicated that eye-tracking indices were positively correlated with students’ anxiety toward online search tasks. Students’ search achievement scores were positively correlated with their pupil sizes on relevant webpages and were negatively correlated with fixation durations on irrelevant webpages. In addition, students’ prior knowledge and pupil size on reading relevant webpages can significantly predict students’ achievement scores of the task. That is, students who had higher prior knowledge and larger pupil sizes on reading relevant webpages tended to have higher search achievement. It is worth noting that pupil size could be served as an indicator of students’ mental efforts while searching and reading online information. Future studies are suggested to further explore the relationships between students’ pupil diameters and search performances so that we can understand more about the role of the pupil size played in the cognitive process of online search.

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