Analysis of saliency of facial features through psychophysical scaling
Hiroshi Hojo · Japanese Psychological Research · 1988
Sixteen side-view smiling faces having two defining properties of the left eye and a mouth which were drawn by arcs with varying curvatures were rank ordered by 24 university students according to their perceived intensities of smiling. The analysis by a nonmetric maximum likelihood scaling method has revealed (1) that the data are approximately described by an inverse logistic function of a physical measure defined as a weighted sum of eye and mouth curvatures, and (2) that eye is 1.39 times as important as mouth in perceiving the intensity of smiling of faces. Comparison between the relative importance of eye to mouth estimated from this analysis and that from the preceding work on front-view smiling faces suggests that the right and left eyes are “integrally” combined to contribute to the overall perceived intensity of smiling of faces.