| Previous studies have explored the similarities and differences in the processing mechanisms of the Ebbinghaus illusion and the Ponzo illusion at the perceptual level.The results suggest that the two visual size illusions have different processing mechanisms.In this study,three types of response manners（keypress,pointing movement and eye movement）were used to explore the characterization of the two visual size illusions at the response level and the difference between the processing mechanisms of two visual size illusions.The results of study 1 showed that in the perceptual task（i.e.,keypress response）,significant Ebbinghaus and Ponzo illusion effects were observed.However,in the pointing task,significant illusion effect was observed for the Ebbinghaus illusion rather than the Ponzo illusion.Compared with the perceptual task,the Ebbinghaus and the Ponzo illusion effects in the pointing task were significantly reduced.In study 2,significant Ebbinghaus illusion and Ponzo illusion effects were observed on the fixation duration and fixation times of eye movement,and there was no significant difference in fixation duration and fixation times between the two size illusions.However,no illusion effect was observed on the saccade latency and movement time of eye movement.In addition,there was no significant difference between the two size illusions in terms of saccade latency and movement time.The findings suggest that visual size illusions can be represented at the motor level,but to a less degree in comparison to those at the perceptual level,in supporting of the two visual stream theory.The difference between the two visual size illusions at the motor level is similar to that at the perceptual level,that is to say,the difference in the processing mechanisms of the Ebbinghaus illusion and the Ponzo illusion can be observed at both the perceptual and the motor levels,suggesting that their difference might originate from the early stage of visual information processing. |
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