Abstract
Ebbinghaus illusion is a typical size illusion. However, the neural mechanism of this illusion is still elusive. Previous studies mainly focused on the role of human early visual cortex and ventral pathway on Ebbinghaus illusion by using the method of fMRI. Till now, there are few studies on the brain morphometric basis of Ebbinghaus illusion. In addition, as a robust illusion, the relationship of Ebbinghaus illusion and human personality is worth studying. The current study investigated the neural mechanism of Ebbinghaus illusion and its relationship to human personality. We found that the effect of Ebbinghaus illusion was positively correlated to the regional gray matter volume of left orbitofrontal cortex (OFC) and left dorsolateral prefrontal cortex (DLPFC); the effect of Ebbinghaus illusion was negatively correlated to the total score of Barratt Impulsiveness Scale (BIS); impulsiveness mediated the relationship between left OFC and Ebbinghaus illusion. The results revealed that, as a stable characteristic of individuals, impulsiveness plays an important role in the generation of Ebbinghaus illusion. Our study is the first attempt to investigate the mechanism of visual illusion based on personality and brain morphometry. It advances our knowledge of visual processing and has potential practical significance.
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