For touch, “rough–smooth” had the highest IPC values. Unexpectedly, the visual adjective “matte–gloss” followed next. This may suggest that participants imagined that rough surfaces were matte and smooth surfaces were glossy. The judgment of “new–old” followed. Other low-level tactile perceptions of material properties adjectives, such as “warmth,” “density,” “heaviness,” “hardness,” and “wetness,” were not shown to be as high. This may suggest that the method used in this study of lightly touching the surface with an index finger does not give much information besides “surface roughness.”
For vision, audition, and touch, the IPC values had a tendency to be high for adjectives of perceptual properties and low for adjectives of affective properties, though not in all cases.