Causal manipulation of feed-forward and recurrent processing differentially affects measures of consciousness.
Causal manipulation of feed-forward and recurrent processing differentially affects measures of consciousness.
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前馈和循环处理的因果操作对意识测量有不同的影响。
DOI：
10.1093/nc/niaa015
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发表时间：
2020
影响因子：
4.1
通讯作者：
Allen C
中科院分区：
文献类型：
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作者：
Allen C
有理论认为，皮层前馈和循环神经活动分别支持无意识和有意识的认知过程。在这里，我们通过应用事件相关的经颅磁刺激（TMS）在早期和晚期相对于视觉刺激，以及一个旨在抑制有意识检测的脉冲，对这一命题进行了因果检验。与预先登记的假设一致，早期经颅磁刺激影响剩余的，据报道是“看不见的”能力。然而，意识知觉在更大程度上也严重依赖于前馈加工，而不是后期的复发阶段。额外的探索性分析表明，这些早期效应与自上而下的标准测量分离，后者受后期经颅磁刺激的影响最大。这些发现与前馈和循环过程对应于无意识和有意识机制的简单二分法不一致。相反，意识的不同组成部分可能对应于皮层动力学的不同阶段，在这些阶段中，最初的加工大致是感性的，而后来的循环加工可能与报告的决定有关。
It has been theorized that cortical feed-forward and recurrent neural activity support unconscious and conscious cognitive processes, respectively. Here we causally tested this proposition by applying event-related transcranial magnetic stimulation (TMS) at early and late times relative to visual stimuli, together with a pulse designed to suppress conscious detection. Consistent with pre-registered hypotheses, early TMS affected residual, reportedly ‘unseen’ capacity. However, conscious perception also appeared critically dependent upon feed-forward processing to a greater extent than the later recurrent phase. Additional exploratory analyses suggested that these early effects dissociated from top-down criterion measures, which were most affected by later TMS. These findings are inconsistent with a simple dichotomy where feed-forward and recurrent processes correspond to unconscious and conscious mechanisms. Instead, different components of awareness may correspond to different phases of cortical dynamics in which initial processing is broadly perceptual whereas later recurrent processing might relate to decision to report.