These results show that different patterns were observed when different materials (stone and wood) were tested, even when the same participants and adjectives were utilized. This suggests that the pattern of results obtained in the present study is specific to wood, and cannot be generalized to other materials. The results also suggest that low IPC values do not always mean a higher processing level. IPC values will be lower if the task is difficult. In the case of wood, information regarding “surface glossiness” and “surface clarity” was difficult to ascertain. In the case of stone, information about “surface glossiness” and “surface brightness” were equally useful, resulting in high IPC values for both adjectives. Of importance, these results confirmed that participants correctly understood the concept of “surface glossiness,” since they showed high IPC values for “surface glossiness” in the stone condition.