Yang Bin, Ma Xiaoli, Schweinhart April M, Wang Fang, Sun Meirong, Song Yan
State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100875, China.
Vision Res. 2012 May 1;60:95-100. doi: 10.1016/j.visres.2012.03.011. Epub 2012 Mar 29.
The experiments described here used event-related potentials (ERPs) to investigate the neural processes of the horizontal effect, in which visual performance is worst for horizontal and best for oblique orientations. EEGs were recorded while human adult subjects performed an orientation identification task with broad-band noise stimuli. The results showed that the difference between cardinal orientations and oblique orientations first occurred at P2 component around 200 ms post-stimulus onset, which is much later than the traditional oblique effect. Additionally, the P3 was much smaller and earlier for oblique orientations than for cardinal orientations. These findings indicated that, compared to the classical oblique effect, the horizontal effect with broad-band noise stimuli might occur at relatively later stages of visual information processing and might involve more complex neural mechanisms.
此处所描述的实验使用事件相关电位（ERP）来研究水平效应的神经过程，在该效应中，视觉表现对于水平方向最差，而对于倾斜方向最佳。在成年人类受试者执行宽带噪声刺激的方向识别任务时记录脑电图。结果表明，主要方向和倾斜方向之间的差异首先出现在刺激开始后约200毫秒的P2成分处，这比传统的倾斜效应要晚得多。此外，对于倾斜方向，P3比主要方向要小且出现得更早。这些发现表明，与经典的倾斜效应相比，宽带噪声刺激下的水平效应可能发生在视觉信息处理的相对较晚阶段，并且可能涉及更复杂的神经机制。
