McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University, Montréal, Québec, Canada.
McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University, Montréal, Québec, Canada.
Conscious Cogn. 2022 Apr;100:103316. doi: 10.1016/j.concog.2022.103316. Epub 2022 Mar 28.
Conscious perceptual experiences are expected to correlate with content-specific brain activity. A veridicality problem arises when attempting to disentangle unconscious and conscious brain processes if conscious perceptual contents accurately match the physical nature of the stimulus. We argue that perceptual filling-in, a phenomenon whereby visual information inaccurately spreads across visual space, is a promising approach to circumvent the veridicality problem. Filling-in generates non-veridical although unambiguous percepts dissociated from stimulus input. In particular, the radial uniformity illusion induces a filling-in experience between a central disk and the surrounding periphery. We discuss how this illusion facilitates both the detection of neurophysiological responses and subjective phenomenological monitoring. We report behavioral effects from a large-sample (n = 200) psychophysics study and examine key stimulus parameters that drive the conscious filling-in experience. We propose that these data underpin future hypothesis-driven studies of filling-in to further delineate the neural mechanisms of conscious perception.
有意识的知觉体验应该与特定于内容的大脑活动相关联。如果无意识和有意识的大脑过程试图被分离，那么就会出现真实性问题，因为有意识的知觉内容准确地匹配刺激的物理性质。我们认为，知觉填补是一种视觉信息不准确地在视觉空间中扩散的现象，这是一种规避真实性问题的有前途的方法。填补会产生非真实性的但与刺激输入分离的明确知觉。特别是，径向均匀性错觉在中央圆盘和周围外围之间诱导出填补体验。我们讨论了这种错觉如何促进神经生理响应的检测和主观现象学监测。我们报告了一项大样本（n=200）心理物理学研究的行为效应，并研究了驱动有意识的填补体验的关键刺激参数。我们提出，这些数据为未来基于假设的填补研究提供了基础，以进一步描绘有意识知觉的神经机制。
