图形-背景分离的电生理相关性直接反映了感知显著性。
Electrophysiological correlates of figure-ground segregation directly reflect perceptual saliency.
作者信息
Straube Sirko, Grimsen Cathleen, Fahle Manfred
机构信息
Department of Human Neurobiology, University of Bremen, Hochschulring 18, 28359 Bremen, Germany.
出版信息
Vision Res. 2010 Mar 5;50(5):509-21. doi: 10.1016/j.visres.2009.12.013. Epub 2010 Jan 4.
In a figure identification task, we investigated the influence of different visual cue configurations (spatial frequency, orientation or a combination of both) on the human EEG. Combining psychophysics with ERP and time-frequency analysis, we show that the neural response at about 200ms reflects perceptual saliency rather than physical cue contrast. Increasing saliency caused (i) a negative shift of the posterior P2 coinciding with a power decrease in the posterior theta-band and (ii) an amplitude and latency increase of the posterior P3. We demonstrate that visual cues interact for a percept that is non-linearly related to the physical figure-ground properties.
在一项图形识别任务中，我们研究了不同视觉线索配置（空间频率、方向或两者的组合）对人类脑电图的影响。结合心理物理学与事件相关电位（ERP）和时频分析，我们发现约200毫秒时的神经反应反映的是感知显著性而非物理线索对比度。显著性增加导致：（i）后部P2负向偏移，同时后部θ波段功率下降；（ii）后部P3的幅度和潜伏期增加。我们证明视觉线索会相互作用以形成一种与物理图形-背景属性呈非线性关系的感知。
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