Motion Illusion on Form with Different Types of Line Graphic

Abstract

This study observed the presence of rotational speed thresholds to determine the effects of different types of line graphics on the results and perceptions of three motion illusions (i.e., apparent movement, induced movement, and movement afterimage). Moreover, this study explored interactive and causal relationships among line graphics, rotational speed, and the aforementioned three phenomena. Several experiments were conducted by adopting the method of adjustment derived from psychophysical methods. The findings revealed that different line graphics and rotational speed settings resulted in visual disturbances that differed in terms of emergence, strength, and conversion. In addition, different line graphics and rotational speeds had causal relationships with the upper–lower absolute threshold values of said motion movements. Different types of line graphics on forms led to different phenomena of line afterimage (PLAs) between each interstimulus interval (ISI) in apparent movement, created the PLA between each ISI in induced movement when the rotational speed decreased, caused the phenomenon of line mixing when the rotational speed increased, and produced the phenomenon of line curving and the PLA between each ISI in motion afterimage. The line graphics with low curving degrees produced an effect known as visual association.