Tagliazucchi Enzo
Netherlands Institute for Neuroscience, Meibergdreef 47, 1105 BA Amsterdam-Zuidoost, The Netherlands.
Conscious Cogn. 2017 Oct;55:136-147. doi: 10.1016/j.concog.2017.08.008. Epub 2017 Aug 29.
Conscious awareness refers to information processing in the brain that is accompanied by subjective, reportable experiences. Current models of conscious access propose that sufficiently strong sensory stimuli ignite a global network of regions allowing further processing. The immense number of possible experiences indicates that activity associated with conscious awareness must be highly differentiated. However, information must also be integrated to account for the unitary nature of consciousness. We present a computational model that identifies conscious access with self-sustained percolation in an anatomical network. We show that the amount of integrated information (Φ) is maximal at the critical threshold. To the extent that self-sustained percolation relates to conscious access, the model supports a link between information integration and conscious access. We also identify a posterior "hotspot" of regions presenting high levels of information sharing. Finally, competitive activity spreading qualitatively describes the results of paradigms such as backward masking and binocular rivalry.
意识觉知是指大脑中伴随着主观的、可报告体验的信息处理过程。当前的意识通达模型提出，足够强烈的感觉刺激会激发一个全局的脑区网络，从而允许进一步的处理。大量可能的体验表明，与意识觉知相关的活动必定高度分化。然而，信息也必须被整合起来，以解释意识的统一性质。我们提出了一个计算模型，该模型将意识通达与解剖学网络中的自维持渗流相识别。我们表明，在临界阈值处，整合信息（Φ）的量最大。就自维持渗流与意识通达相关而言，该模型支持信息整合与意识通达之间的联系。我们还识别出了一个呈现高水平信息共享的后部“热点”脑区。最后，竞争性活动传播从性质上描述了诸如反向掩蔽和双眼竞争等范式的结果。
