Uncovering the neural magnitude and spatio-temporal dynamics of natural image categorization in a fast visual stream
Uncovering the neural magnitude and spatio-temporal dynamics of natural image categorization in a fast visual stream
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DOI：
10.1016/j.neuropsychologia.2016.07.028
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发表时间：
2016-10-01
期刊：
影响因子：
2.6
通讯作者：
Rossion, Bruno
中科院分区：
文献类型：
--
作者：
Retter, Talia L.;Rossion, Bruno
感知分类在自然观看条件下迅速发生。然而，神经时空动态的类别选择过程，以单一的一瞥，自然（即，未分割的）图像在快速变化的呈现流中保持未知。我们以12.5 Hz的快速周期性速率向人类观察者呈现物体的自然图像，即，每3、5、7、9或11个刺激插入面部图像，定义240-880 ms之间的刺激起始时间（SOA），即，呈现频率（Fs）在4.17-1.14 Hz之间。在F及其谐波（2F，3F等）下客观地识别和量化了鲁棒的面部选择性反应。每一种情况下的脑电图在最低的面SOA，即两个面之间的240 ms时，和谐面选择性反应显著降低了25%，但从400 ms SOA开始保持稳定。这种高水平的右侧化面部选择性反应出现在刺激后约100 ms，并在空间上在四个连续的时间窗口（即，P1-面、N1-面、P2-面、P3-面）。在一个快速的对象序列中的一个简要介绍的面部刺激的类别选择性反应的总持续时间估计为420毫秒。揭示神经时空动态的类别选择性在一个快速的自然图像流远远超出了以前的证据从空间和时间上孤立的刺激，打开了一条途径，了解人类的视觉和它的关系，分类行为。(C)2016爱思唯尔有限公司版权所有。
Perceptual categorization occurs rapidly under natural viewing conditions. Yet, the neural spatio-temporal dynamics of category-selective processes to single-glanced, natural (i.e., unsegmented) images in a rapidly changing presentation stream remain unknown. We presented human observers with natural images of objects at a fast periodic rate of 12.5 Hz, i.e., every 80 ms. Images of faces were inserted every 3, 5, 7, 9, or 11 stimuli, defining stimulus-onset-asynchronies (SOAs) between 240-880 ms, i.e., presentation frequencies (Fs) between 4.17-1.14 Hz. Robust face-selective responses were objectively identified and quantified at F and its harmonics (2F, 3F, etc.) for every condition in the electroencephalogram (EEG). The summed-harmonic face-selective response was significantly reduced by 25% at the lowest face SOA, i.e. 240 ms between two faces, but remained stable from 400 ms SOA onward. This high-level, right lateralized face-selective response emerged at about 100 ms post-stimulus onset and progressed spatially throughout four successive time-windows (i.e., P1-face, Nl-face, P2-face, P3-face) from posterior to anterior occipito-temporal electrode sites. The total duration of a category-selective response to a briefly presented face stimulus in a rapid sequence of objects was estimated to be 420 ms. Uncovering the neural spatio-temporal dynamics of category-selectivity in a rapid stream of natural images goes well beyond previous evidence obtained from spatially and temporally isolated stimuli, opening an avenue for understanding human vision and its relationship to categorization behavior. (C) 2016 Elsevier Ltd. All rights reserved.