The purpose of this study is to clarify the relationship between a diversity of smiles and facial impressions. The diversity of smiling face representation is expressed based on average images of 10 university students' smiles. 52 samples are made from the average images that changed the strength, the interval of both eyes, the interval between eyes and a mouth and the shape of mouth. 30 respondents have evaluated the impression to samples by SD method, and various smiles were shown in the impression plane by principal component analysis. As a result, the vertical axis of the impression plane to smiles was assumed to be a preference, and the horizontal axis was assumed to be energy. It was found that the interval between eyes and a mouth that was the feature element of an individual face influences the preference. The energy degree of smiles had a connection with to the shape of mouth. The preference of the intensity change of smiles was higher than the caricature smiles.

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本研究の目的は、人の顔の認知に関する基礎的研究をベースに、乗用車のフロントマスクの表情印象を構造化し、表情印象と形態要素の関係性の検証を行い、乗用車のフロントマスクデザイン開発のおいて効果的に表情印象を持たせる為の形態要素を明らかにすることにある。はじめに、21車種のフロントマスクについて、表情印象評価用語(20語)による5段階リッカーと尺度で評価実験を行い、因子分析をした結果、快・不快の因子と覚醒水準の因子を軸とする表情印象マップを作成して、四つの表情印象グループ(Happy、Angry、Bored、Confident)を抽出することができた。次に、各表情印象グループの形態要素とその大きさが表情印象にどのように影響を与えているかを明らかにするため、形態要素をアイテムとしてカテゴリー化し数量化I類理論を用いて、その形態要素と表情印象グループの関係性を明らかにした。

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The present study examined the effects of facial movements on impressions of facial appearance during dynamic smiling. The participants (80 women) rated the 68 women in the videos, posing with a smile, in terms of attractiveness, likability, and beauty on a 5-point scale. The displacements of the sides of both the cheeks and mouth areas in each video were measured using the optical flow method. Five time points were chosen from time series data that had been divided into four equal intervals. T-tests were applied to analyze the differences in displacements and velocities between the higher- and lower-rated-stimulus groups. The results indicate that the magnitudes of the initial displacements and the acceleration of the initial velocities were most important in creating a positive impression of dynamic smiles. The results also show that there are both common and specific relationships between facial movements and impressions of facial appearance.

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