Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Auditory dominance refers to the auditory information in multisensory integration; more priority is given to auditory information, and it is processed in a dominant position. Sound-induced flash illusion (SiFI) is a typical auditory dominance phenomenon, namely, the visual perception of a stimulus for briefly heard voices, qualitatively changing at the same time, resulting in a fission illusion (F1B2) and a fusion illusion (F2B1). Previous studies have shown that elderly adults experience illusions more often than young adults. However, there is not yet a consensus regarding the mechanism when it is investigated using resting fMRI, though resting-state neural activity can reveal the intrinsic functional architecture of the brain (Fox & Raichle, 2007). Therefore, the present study aims to investigate how resting-state neural activity (ALFF) is related to SiFIs in elderly adults and will provide important novel insights into the differences in SiFIs between elderly and young adults.We selected 50 elderly adults (ages: 50~69 year old, M = 61.78, SD = 4.17) and 50 young adults (ages: 17~27 year old, M = 20.86, SD = 2.17). The present study was a 2 (participants: elderly vs. young adults) × 2 (flash number: 1 vs. 2) × 3 (sound number: 0 vs. 1 vs 2) mixed design. RS-fMRI data were collected by a magnetic resonance scanner in the participants’ natural state of wakefulness and relaxation. The RS-fMRI data were obtained by a Philips 3.0T magnetic resonance scanner, and the images of all participants' resting states were obtained by gradient echoplanar imaging (EPI) and scan parameters as follows: the TR = 2000 ms, TE = 30 ms, of view (FOV) = 220 mm × 220 mm, Turn corner = 90°, matrix = 64×64, Layer number = 36, layer thickness = 4 mm, with a thick layer of scanning time 400 s. We used the low-frequency amplitude of the resting state of the brain (ALFF) to investigate the correlation between SiFI and spontaneous brain region activity in elderly and young adults to reveal SiFI differences. ALFF results were calculated using DPABI, an RS-fMRI data processing software ( Yan et al., 2016). From the perspective of the accuracy results, elderly and young adults both experienced fission and fusion illusions. However, regardless of experiencing a fission illusion or a fusion illusion, the amount of illusion experienced by elderly adults was greater than that experienced by young adults. From the correlation analysis results of ALFF and illusions, there was a significant positive correlation between the F1B2 illusion and spontaneous medial prefrontal cortex (MPFC) activity in elderly adults, and there was a significant negative correlation between the F1B2 illusion and spontaneous activity in the right superior occipital gyrus (SOG) and the left lingual gyrus in young adults. For the F2B1 illusion, there was a significant negative correlation between the F2B1 illusion and spontaneous activity in the right superior occipital gyrus (SOG), the left lingual gyrus (IFG) and the right cerebellum and a significant positive correlation between the F2B1 illusion and the spontaneous activity in the left inferior frontal gyrus (IFG), the right middle frontal gyrus (MFG) and the left inferior temporal gyrus (ITG) in elderly adults. However, there was a significant positive correlation between the F2B1 illusion and spontaneous activity in the left superior frontal gyrus (SFG) in young adults. The present study showed that the increased illusions experienced by elderly adults were related to spontaneous activity during resting states in multiple brain regions.
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