Early electrophysiological indices of illusory contour processing within the lateral occipital complex are virtually impervious to manipulations of illusion strength.
Early electrophysiological indices of illusory contour processing within the lateral occipital complex are virtually impervious to manipulations of illusion strength.
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DOI：
10.1016/j.neuroimage.2011.10.051
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发表时间：
2012-02-15
期刊：
影响因子：
5.7
通讯作者：
Foxe, John J.
中科院分区：
文献类型：
--
作者：
Altschuler, Ted S.;Molholm, Sophie;Russo, Natalie N.;Snyder, Adam C.;Brandwein, Alice B.;Blanco, Daniella;Foxe, John J.
当输入碎片或不完整时，视觉系统可以自动插值或“填充”对象的边界。一类被称为虚幻轮廓（IC）刺激的标准视觉刺激已被广泛用于研究这种轮廓插值过程。视觉诱发电位 (VEP) 研究已经确定了这些边界完成过程的神经特征，即所谓的 IC 效应，通常在 90-110 毫秒开始，并在枕外侧复合体 (LOC) 内产生。在这里，我们着手使用虚幻轮廓刺激和大脑活动的高密度头皮记录来确定自动边界完成的限制因素。视网膜偏心率、真实轮廓与虚幻轮廓的比率（即支撑比）和诱导器直径均以参数方式变化，并检查对 IC 效应的幅度和潜伏期产生的任何影响。令人有些惊讶的是，IC 效应的幅度被发现不受这些刺激参数的所有变化的影响，而已知的操作会影响感知的幻觉强度。因此，对象处理的这个自动阶段似乎是一个二元过程，其中只要满足最低条件，轮廓就会自动完成。同时，发现 IC 效应的延迟与支持率成反比，这可能反映了在隐含对象的相对较长的诱导边界上进行插值所需的额外时间。这些数据在两阶段对象识别模型的背景下进行解释，该模型将处理解析为早期自动感知阶段，随后是更费力的概念处理阶段。
The visual system can automatically interpolate or “fill-in” the boundaries of objects when inputs are fragmented or incomplete. A canonical class of visual stimuli known as illusory-contour (IC) stimuli have been extensively used to study this contour interpolation process. Visual evoked potential (VEP) studies have identified a neural signature of these boundary completion processes, the so-called IC-effect, which typically onsets at 90–110ms and is generated within the lateral occipital complex (LOC). Here we set out to determine the delimiting factors of automatic boundary completion with the use of illusory contour stimuli and high-density scalp recordings of brain activity. Retinal eccentricity, ratio of real to illusory contours (i.e. support ratio), and inducer diameter were each varied parametrically, and any resulting effects on the amplitude and latency of the IC-effect were examined. Somewhat surprisingly, the amplitude of the IC-effect was found to be impervious to all changes in these stimulus parameters, manipulations that are known to impact perceived illusion strength. Thus, this automatic stage of object processing appears to be a binary process in which, so-long as minimal conditions are met, contours are automatically completed. At the same time, the latency of the IC-effect was found to vary inversely with support ratio, likely reflecting the additional time necessary to interpolate across the relatively longer induced boundaries of the implied object. These data are interpreted in the context of a two stage object-recognition model that parses processing into an early automatic perceptual stage that is followed by a more effortful conceptual processing stage.
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影响因子：
5.3
作者：
Murray, Micah M.;Imber, Michelle L.;Foxe, John J.
通讯作者：
Foxe, John J.
DOI：
10.3758/bf03204240
发表时间：
1976-01-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
DUMAIS, ST;BRADLEY, DR
通讯作者：
BRADLEY, DR
DOI：
10.1073/pnas.92.18.8135
发表时间：
1995-08-29
影响因子：
11.1
作者：
MALACH, R;REPPAS, JB;TOOTELL, RBH
通讯作者：
TOOTELL, RBH
DOI：
10.1016/0013-4694(94)90193-7
发表时间：
1994-10-01
期刊：
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
影响因子：
--
作者：
MILTNER, W;BRAUN, C;RUCHKIN, DS
通讯作者：
RUCHKIN, DS
影响因子：
2.6
作者：
Murray, MM;Foxe, JJ;Schroeder, CE
通讯作者：
Schroeder, CE