Amadeo Maria Bianca, Tonelli Alessia, Campus Claudio, Gori Monica
U-VIP Unit for Visually Impaired People, Fondazione Istituto Italiano di Tecnologia, Via E. Melen 83, 16152 Genova, Italy.
U-VIP Unit for Visually Impaired People, Fondazione Istituto Italiano di Tecnologia, Via E. Melen 83, 16152 Genova, Italy.
Brain Res. 2022 Feb 1;1776:147744. doi: 10.1016/j.brainres.2021.147744. Epub 2021 Nov 27.
When a brief flash is quickly presented aligned with a moving target, the flash typically appears to lag behind the moving stimulus. This effect is widely known in the literature as a flash-lag illusion (FLI). The flash-lag is an example of a motion-induced position shift. Since auditory deprivation leads to both enhanced visual skills and impaired temporal abilities, both crucial for the perception of the flash-lag effect, here we hypothesized that lack of audition could influence the FLI. 13 early deaf and 18 hearing individuals were tested in a visual FLI paradigm to investigate this hypothesis. As expected, results demonstrated a reduction of the flash-lag effect following early deafness, both in the central and peripheral visual fields. Moreover, only for deaf individuals, there is a positive correlation between the flash-lag effect in the peripheral and central visual field, suggesting that the mechanisms underlying the effect in the center of the visual field expand to the periphery following deafness. Overall, these findings reveal that lack of audition early in life profoundly impacts early visual processing underlying the flash-lag effect.
当一个短暂的闪光与一个移动的目标快速对齐呈现时，该闪光通常看起来滞后于移动的刺激。这种效应在文献中被广泛称为闪光滞后错觉（FLI）。闪光滞后是运动诱导位置偏移的一个例子。由于听觉剥夺会导致视觉技能增强和时间能力受损，而这两者对于闪光滞后效应的感知都至关重要，因此我们在此假设，缺乏听觉可能会影响FLI。13名早期失聪者和18名听力正常者在视觉FLI范式中接受测试以探究这一假设。正如预期的那样，结果表明早期失聪后，中央和周边视野中的闪光滞后效应均有所降低。此外，仅对于失聪个体而言，周边视野和中央视野中的闪光滞后效应之间存在正相关，这表明失聪后，视野中心该效应背后的机制扩展到了周边。总体而言，这些发现揭示了生命早期缺乏听觉会深刻影响闪光滞后效应背后的早期视觉处理。
