抄録
As seen in Mach's square and diamond, simple geometrial figures of equal area and different shapes look different in area or size. We found that triangular or diamond contours appear larger than circular or rectangular contours. In order to confirm this figural shape effect with varying visual angle of the stimuli, we adopted the method of area matching. The results supported the previous finding and showed that figural shape visual angle interaction had significant effects. That is, the figural shape effect was influened by changing the visual angle. These findings suggest the importance of figural extent or perimeter as a determinant of area perception.
