Zhou Heng, Liu Xiaole, Yu Junming, Yue Chunlin, Wang Aijun, Zhang Ming
Department of Psychology, Research Center for Psychology and Behavioral Sciences, Soochow University, Suzhou 215123, China.
School of Physical Education and Sport Science, Soochow University, Suzhou 215021, China.
Brain Sci. 2022 Oct 21;12(10):1418. doi: 10.3390/brainsci12101418.
Sound-induced flash illusion (SiFI) is typical auditory dominance phenomenon in multisensory illusion. Although a number of studies have explored the SiFI in terms of age-related effects, the reasons for the enhanced SiFI in older adults are still controversial. In the present study, older and younger adults with equal visual discrimination were selected to explore age differences in SiFI effects, and to explore the neural indicators by resting-state functional magnetic resonance imaging (rs-fMRI) signals. A correlation analysis was calculated to examine the relationship between regional homogeneity (ReHo) and the SiFI. The results showed that both younger and older adults experienced significant fission and fusion illusions, and fission illusions of older adults were greater than that of younger adults. In addition, our results showed ReHo values of the left middle frontal gyrus (MFG), the right inferior frontal gyrus (IFG) and right superior frontal gyrus (SFG) were significantly positively correlated with the SiFI in older adults. More importantly, the comparison between older and younger adults showed that ReHo values of the right superior temporal gyrus (STG) decreased in older adults, and this was independent of the SiFI. The results indicated that when there was no difference in unisensory ability, the enhancement of multisensory illusion in older adults may not always be explained by compensation mechanisms.
声音诱发的闪光错觉（SiFI）是多感官错觉中的典型听觉优势现象。尽管许多研究已经从年龄相关影响的角度探讨了SiFI，但老年人中SiFI增强的原因仍存在争议。在本研究中，选择了视觉辨别能力相同的老年人和年轻人，以探讨SiFI效应的年龄差异，并通过静息态功能磁共振成像（rs-fMRI）信号探索神经指标。计算了相关性分析以检验局部一致性（ReHo）与SiFI之间的关系。结果表明，年轻人和老年人都经历了显著的裂变和融合错觉，且老年人的裂变错觉大于年轻人。此外，我们的结果显示，老年人左侧额中回（MFG）、右侧额下回（IFG）和右侧额上回（SFG）的ReHo值与SiFI显著正相关。更重要的是，老年人与年轻人的比较显示，老年人右侧颞上回（STG）的ReHo值降低，且这与SiFI无关。结果表明，当单感官能力没有差异时，老年人多感官错觉的增强可能并不总是由补偿机制来解释。
