How the visual cortex handles stimulus noise: insights from amblyopia.
How the visual cortex handles stimulus noise: insights from amblyopia.
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DOI：
10.1371/journal.pone.0066583
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Vidnyánszky Z
中科院分区：
文献类型：
--
作者：
Bankó ÉM;Körtvélyes J;Weiss B;Vidnyánszky Z
在视觉图像中加入噪声会使物体识别更加费力，并对人类的电生理反应产生广泛的影响。然而，直接参与处理的刺激噪声的视觉皮层过程尚未被确定和解离的神经反应的调制，由于恶化的结构信息和增加的刺激不确定性的情况下，嘈杂的图像。在这里，我们表明，在弱视患者的噪声图像的情况下，面部性别分类性能的损害与弱视缺陷中测量的单次试验事件相关电位（ERP）的P1/P2组件的噪声诱导的调制。另一方面，N170 ERP成分同样受到双眼中噪声存在的影响，其调制并不能预测行为缺陷。这些结果表明，噪声图像的有效处理取决于额外的处理资源的参与，无论是在早期，功能特定的，以及后来，对象水平的阶段，视觉皮层处理反映在P1和P2 ERP组件，分别。我们的研究结果还表明，噪声引起的调制的N170组件可能反映减少面部选择性神经元反应的面部图像与恶化的结构信息。
Adding noise to a visual image makes object recognition more effortful and has a widespread effect on human electrophysiological responses. However, visual cortical processes directly involved in handling the stimulus noise have yet to be identified and dissociated from the modulation of the neural responses due to the deteriorated structural information and increased stimulus uncertainty in the case of noisy images. Here we show that the impairment of face gender categorization performance in the case of noisy images in amblyopic patients correlates with amblyopic deficits measured in the noise-induced modulation of the P1/P2 components of single-trial event-related potentials (ERP). On the other hand, the N170 ERP component is similarly affected by the presence of noise in the two eyes and its modulation does not predict the behavioral deficit. These results have revealed that the efficient processing of noisy images depends on the engagement of additional processing resources both at the early, feature-specific as well as later, object-level stages of visual cortical processing reflected in the P1 and P2 ERP components, respectively. Our findings also suggest that noise-induced modulation of the N170 component might reflect diminished face-selective neuronal responses to face images with deteriorated structural information.
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