在人機互動的設計上，手勢可作為自然而直覺的溝通管道，而在新的互動模式中，電腦偵測人的肢體動作，解讀其意涵，予以適切之回饋。然而，相較具慣例性的手語系統，手勢具有歧義性，因其在不同的環境涵構下有不同的解讀。本研究目的在建構一套模型，描述並解讀在特定情境中的手勢事件，並且透過民族學的研究方法，分析特定場合中，認知空間、實質空間、與社群空間，三項涵構因子對解讀五類手勢產生之影響，以驗證模型的適用性。本研究以東海建築系大學部設計評圖的場合為研究標的，分析數位錄影資料，擷取203筆手勢為樣本，經過分類後，對照三項涵構因子，結果顯示認知空間對手勢有顯著的影響，其次為社群空間，而實質空間的影響僅只於圖與模型設計媒材之差異，本研究歸納在各項因子的交互作用下，產生手勢意涵之解讀，研究成果修正理論模型的涵構內容，並建構資料庫，作為描述手勢事件的知識基礎。

Perceptual interface captures user’s natural behavior and acts properly according to the message it conveys. Comparing to the well-established sign languages, meanings of gestures are ambiguous and situation-dependent. Their interpretations rely on external information. We proposed a model of situated gestures whose meanings result from association of a context of three dimensions: cognitive, social, and physical. Feasibility of the model was tested on a real site by method of cognitive ethnographic research. The occasion of design presentation and critique was selected as a field site. 203 gestural segments were selected from digital video data. We outlined the contextual factors and examined their impacts on determining five types of gesture patterns. Cognitive space had direct influence them, while social network and physical space determined merely the use of deictic gestures. The result was used to fulfill and revised the conceptual framework for processing meanings of gestures. As for reliability of the perceptual interface system, it was built on the commonsense database of contextual information, including information of project theme, dialogue modes, physical environment, social network, and individual actors. Future work is built on the accumulation of prior knowledge of gesture interpretation.

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