先验视觉情境加速物体表征的出现：一项 MEG 研究
Prior visual context accelerates the emergence of object representations
依据摘要，研究者用 MEG 考察场景情境如何改变视觉物体的神经表征，并检验情境是单纯增强预期物体的表征，还是重组物体信息在大脑中的时间轨迹。采用时间泛化解码，作者报告当物体与先前情境一致时，多个语义信息维度提前最多 200 ms 出现，且这种时间前移的解码与行为层面的物体识别速度相关。
Our knowledge about how the world is structured allows for predictions about what objects we might see next. Visual context is known to impact the perception of subsequent objects, but we do not know what context does to the mental representation of those objects. Using MEG, we tested how a scene context changes the neural representation of visual objects, and whether the context simply enhances expected object representations, or if it acts to reorganise the temporal trajectory of object information in the brain. Using temporal generalisation decoding, we show that multiple dimensions of semantic information are shifted up to 200 ms earlier when the object and the prior context are congruent, and this temporally-shifted decoding was related to behavioural object recognition speed. This suggests that prior context can warp the temporal trajectory through which object representations are accessed and accelerate the emergence of semantic object representations in the mind.
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来源：bioRxiv · Neuroscience · biorxiv.org