In the original double flash illusion, a visual flash (e.g., a sharp-edged disk, or uniformly filled circle) presented with two short auditory tones (beeps) is often followed by an illusory flash. The illusory flash has been previously shown to be triggered by the second auditory beep. The current study extends the double flash illusion by showing that this paradigm can not only create the illusory repeat of an on-off flash, but also trigger an illusory expansion (and in some cases a subsequent contraction) that is induced by the flash of a circular brightness gradient (gradient disk) to replay as well. The perception of the dynamic double flash illusion further supports the interpretation of the illusory flash (in the double flash illusion) as similar in its spatial and temporal properties to the perception of the real visual flash, likely by replicating the neural processes underlying the illusory expansion of the real flash. We show further that if a gradient disk (generating an illusory expansion) and a sharp-edged disk are presented simultaneously side by side with two sequential beeps, often only one visual stimulus or the other will be perceived to double flash. This indicates selectivity in auditory-visual binding, suggesting the usefulness of this paradigm as a psychophysical tool for investigating crossmodal binding phenomena.

中文翻译：

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动态双闪错觉：幻觉视觉扩展的听觉触发重播。

在最初的双闪错觉中，视觉闪现（例如，尖锐边缘的圆盘或均匀填充的圆圈）伴随着两个短促的听觉音调（哔哔声）通常伴随着虚幻的闪现。先前已证明幻觉闪光是由第二声蜂鸣声触发的。目前的研究扩展了双重闪光错觉，表明这种范式不仅可以创造开关闪光的幻觉重复，还可以触发由闪光诱发的幻觉扩张（以及在某些情况下随后的收缩）。圆形亮度渐变（​​渐变盘）也可以重播。动态双闪错觉的感知进一步支持对幻觉（在双闪错觉中）的解释，其空间和时间特性与真实视觉闪光的感知相似，可能是通过复制真实闪光的虚幻扩张背后的神经过程。我们进一步表明，如果梯度圆盘（产生虚幻的扩展）和锐边圆盘同时并排呈现并发出两个连续的哔哔声，通常只有一种视觉刺激或另一种会被感知为双闪。这表明视听结合的选择性，表明这种范式作为研究跨模式结合现象的心理物理学工具的有用性。