2020 Volume 22 Issue 2 Pages 101-112
Vection is a visually induced self-motion illusion caused by observing a moving pattern in certain direction. Vection is classified into two types based on its moving direction: linear vection (LV; rectilinear motion sense) and circular vection (CV; rotational motion sense). In our previous study, we found a negative relationship between forward LV and counter-clockwise CV strength from the spiral-motion stimulus. Additionally, the integrated vection strength (i.e., the direction of self-motion to be evaluated is not specified) from the identical stimulus was consistent with a vector sum of LV and CV strength measured separately. In this paper, we investigated whether such tendency would be observed in other radial and rotational direction combinations. From the result, there was a negative correlation between LV and CV the negative relationship regardless of the combination of perceived LV and CV. The integrated vection strength was has a consistent tendency with the vector sum of LV and CV strength measured separately but there were slight difference according to the motion-direction of the stimulus.
