政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/69433

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Title:	臉部表情的分類判斷是否受之前的情境脈絡影響
Other Titles:	The Influence of Sequential Context on Facial Expression Categorization
Authors:	徐慎謀
Contributors:	心智、大腦與學習研究中心
Keywords:	臉部表情;決策;分類;情境 facial expression;decision;categorization;context
Date:	2011
Issue Date:	2014-08-28 12:18:06 (UTC+8)
Abstract:	過往的研究主要著重在人類如何對單一呈現的臉部表情進行分類，而忽略表情分類的過程中是否受到各種情境脈絡的影響。本計劃的研究重點放在當我們對連續呈現的臉部表情進行分類時，之前的情境是否會影響分類的結果。我們的假設是之前所呈現的臉部表情是會影響對當下臉部表情的判斷。本計劃將結合行為研究，以及腦磁波儀和功能性磁振造影的技術探索此一議題。本計劃的執行具其必要性，因所得之結果將有助了解情緒刺激物是如何在時間維度上相互作用，進而影響我們的決策。依據我們初步的實驗證據，本計劃欲達成以下具體目標：一、確認是何種機制導致之前所呈現的臉部表情影響當下臉部表情的分類判斷。二、之前的臉部表情對當下臉部表情的影響是否可藉由腦部活動的變化觀測之。對於第一個目標，本計劃將以行為實驗探討之前與當下臉部表情的差異度是否左右對當下臉部表情的分類。至於第二個目標，本計劃則將以磁波儀和功能性磁振造影的技術探討當下臉部表情所引發的腦部活動是否隨著之前的臉部表情的不同而改變。本計劃所得之結果的重要性在於能幫助拓展心理學上有關情緒以及決策的研究，甚至對涉及人類是如何在不同情境下做判斷的學門如經濟學或其他社會科學等也起一定的助益。 Investigations in the past have mainly focused on how simple unitary categorical decisions are achieved during facial expression categorization. As a consequence, there are still critical gaps in the knowledge base that pertain to the extent to which contextual information modulates categorical processing. Our long-term goal is to contribute a better understanding of the categorical processes of facial expressions, especially how decisions are biased by various sources of contextual information. As the next step toward attainment of our long-term goal, the objective of the current application is to investigate the influence of sequential context on categorical judgements when briefly presented facial expressions are categorized in turn. Our central hypothesis is that previously presented facial expression guides decision making on the current one. To test our hypothesis, we will employ a combination of behavioural, MEG, and fMRI experiments. The rationale for this project is that the completion of the proposed studies will provide a new window to elucidate how temporal emotional information interacts in guiding categorical decisions and ultimately shaping our behaviour. Guided by strong preliminary data, the following specific aims will be pursued in this project: 1) Identify the mechanism responsible for the influence of sequential context; and 2) determine the neural association between the current and the preceding facial expression stimulus when categorical decisions are made in sequential context. Under the first aim, a behavioural approach will be adopted to explore the extent to which the dissimilarity between the current and the preceding facial expression stimulus provides a basis for making categorical decisions. Under the second aim, MEG and fMRI methods will be adopted to investigate the extent to which the neural responses evoked by the current facial expression vary according to different types of preceding facial expressions, and then how such interactions can be used to reliably predict behavioural decisions. The proposed research is innovative, because it capitalizes on how categorical decisions on facial expressions are achieved in sequential context, especially that the mechanism underlying such sequential decision making has been little addressed in the past. The proposed research is significant, because it does not only benefit emotion and decision-related research, but also advance the field of economics or other social sciences, in which sequential decision making plays an important part.
Relation:	行政院國家科學委員會計畫編號NSC100-2410-H004-005-MY2
Data Type:	report
Appears in Collections:	[Research Center for Mind, Brain & Learning] NSC Projects

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