Figure 2.

Stimuli and tasks. (I) Example stimuli in color and grayscale. (II) Binary classification experiment interface. Observers were asked to classify the material of the object as either “translucent” or “opaque.” (III) Semantic attribute rating experiment interface. Observers were asked to rate five translucency-related material attributes using a 6-point scale (6 means high and 1 means low). (IV) Material categorization experiment interface. Observers were asked to choose the material category that best suits the object in the image among 18 categories.