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| Title: | 以功能性磁振造影技術探討線上課程中學習者對於教師在場與否之學習效果與神經機制
An fMRI investigation of neural mechanisms underlying instructor presence effect during online learning |
| Authors: | 葉冠廷
Ye, Guan-Ting |
| Contributors: | 張葶葶
Chang, Ting-Ting
葉冠廷
Ye, Guan-Ting |
| Keywords: | 教師在場
社會線索
功能性磁振造影
線上學習
自然情境實驗
任務狀態功能性連結
前額頂葉網絡
顯著性網絡
人格特質
機器學習
邏輯斯回歸
Instructor presence
Social cue
fMRI
Online learning
Naturalistic experiment
Task-state functional connectivity
Frontoparietal network
Salience network
Personality traits
Machine learning
Logistic regression |
| Date: | 2024 |
| Issue Date: | 2025-09-01 16:12:53 (UTC+8) |
| Abstract: | 隨著線上學習的重要性日益提升，教育者愈發傾向採用虛擬教學作為傳統面授課程的替代方案。儘管過去已有大量行為研究探討線上學習的成效，但有關其背後神經機制的理解仍相對有限，特別是在教師在場效應（instructor presence effect）方面更是鮮少著墨。本研究運用功能性磁振造影（fMRI），探討線上學習中所涉及的認知與神經歷程，聚焦於教師在場效應如何影響注意力、工作記憶以及神經連結性。
在第一項研究中，我們透過自然情境實驗設計，檢驗教師在場效應。受試者觀看兩段材料科學教學影片，一段呈現動態教師影像（具有動作表情與社交線索），另一段則僅顯示教師的靜態照片，期間同時進行 fMRI 掃描。所有受試者皆為非自然科學背景學生。行為結果顯示，相較於靜態教師條件，動態教師條件下的學習成效顯著提升，學習者的參與程度與學習表現亦大幅提高，顯示社會臨場感在數位教學中的關鍵角色。
第二項研究進一步透過任務狀態下的功能性連結分析，探討教師在場對大腦網絡活動的影響。我們聚焦於動態與靜態教師條件對功能性網絡連結之影響，特別是前額頂葉網絡（frontoparietal network, FPN）與顯著性網絡（salience network, SN）之間的連結。結果顯示，動態教師條件顯著增強 FPN 與 SN 間的功能性連結，此網絡組合被認為能夠促進學習者的認知處理與注意力調控。此外，FPN–SN 的連結強度亦調節了注意力與學習成效之間的關係，高連結強度的個體其注意力對學習表現的正向影響更加顯著，進一步揭示教師在場效應背後的神經基礎。
在第三項研究中，我們進一步探討由動態教師所引發的功能性連結是否能有效預測個體在學習成效上的差異，特別是人格特質與注意力參與程度的作用。我們以 FPN–SN 的連結強度作為主要神經特徵，建構邏輯斯回歸模型，將學習者分類為高學習成效與低學習成效兩組。結果顯示，模型在高外向性或低神經質的學習者中預測準確率顯著較高，顯示這些人格特質更容易回應動態教學中所蘊含的社交與認知資源。同時，該模型亦能有效區分高注意力參與者的學習表現，顯示 FPN–SN 網絡的連結強度可增強注意力對學習成效的影響。這些結果突顯了學習行為增益與教師在場所誘發的神經特徵之間的密切關聯。
總結而言，本研究提供了有關線上學習中教師在場效應的嶄新神經認知觀點。研究結果顯示，具有社交互動性與動態表現的教師能有效提升學習成效，其益處來自於強化了前額頂葉網絡與顯著性網絡之間的功能性連結，進而支持學習者的認知處理與注意力維持。透過整合行為數據與神經證據，本研究強調在設計線上學習環境時應納入具社會臨場感的教學策略，以優化學習者的參與度與學習成果。
With the growing importance of online learning, educators increasingly turn to virtual online approaches as alternatives to traditional in-person instruction. However, while numerous behavioral studies have explored the effectiveness of online learning, the underlying neural mechanisms remain largely unexamined, particularly regarding the role of instructor presence. This thesis uses fMRI to investigate the cognitive and neural processes involved in online learning, focusing on the instructor presence effect and its influence on attention, working memory, and neural connectivity.
In Study 1, we conducted a naturalistic experiment to assess the "instructor presence effect" by comparing a live instructor with a static instructor during student watching a science video. We recruited students with non-natural science backgrounds, who then participated in two materials science lectures during fMRI scanning: one featuring a live instructor who employed dynamic expressions and social cues, and the other displaying only a static image of the instructor. Analysis of behavioral data revealed significantly better learning outcomes in the live instructor condition compared to the static image condition. Moreover, the live instructor condition significantly enhanced student engagement and learning performance, underscoring the importance of social presence in online education.
In Study 2, we further examined this presence effect by analyzing task-based functional connectivity via fMRI. Specifically, we compared the neural impact of a live instructor versus a static instructor, investigating how instructor presence influences neural network connectivity and subsequently improves learning outcomes. Neuroimaging results indicated that students in the live instructor condition exhibited stronger functional connectivity between the frontoparietal network (FPN) and the salience network (SN), which facilitates cognitive processing and attentional focus. Additionally, connectivity between the FPN and SN moderated the relationship between attention and learning outcomes; higher connectivity strengthened the positive effects of attention on learning performance, highlighting the neural mechanisms that underpin the instructor presence effect.
In Study 3, we investigated whether the enhanced functional connectivity elicited by live instructor lectures could reliably predict individual differences in learning outcomes, particularly as a function of personality traits and attentional engagement. Using FPN–SN connectivity strength as the primary neural feature, we developed a logistic regression model to classify learners into high and low learning performance groups. The model achieved significantly higher predictive accuracy among individuals with high extraversion or low neuroticism, suggesting that these personality profiles are more responsive to the cognitive and social affordances of dynamic instruction. Additionally, the model effectively distinguished learning outcomes among students with high attentional engagement, indicating that FPN–SN connectivity amplifies the beneficial effects of attention on learning performance. These findings underscore the tight coupling between behavioral learning gains and functional neural signatures associated with instructor presence.
In conclusion, this research offers novel neurocognitive insights into the instructor presence effect in online learning, demonstrating that live, dynamic, and socially engaging instructors can enhance learning outcomes. These benefits are underpinned by the modulation of key neural mechanisms, particularly the strengthened connectivity between the frontoparietal network and salience network, which supports cognitive processing and attentional focus. By linking behavioral and neural evidence, this study highlights the importance of integrating socially interactive instructors into online learning environments to optimize engagement and performance. |
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| Description: | 碩士
國立政治大學
心理學系
111752013 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0111752013 |
| Data Type: | thesis |
| Appears in Collections: | [心理學系] 學位論文
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