Kasai Tetsuko, Morotomi Takashi, Katayama Jun'ichi, Kumada Takatsune
Human Science and Biomedical Engineering, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan.
Brain Res Cogn Brain Res. 2003 Jul;17(2):273-85. doi: 10.1016/s0926-6410(03)00115-0.
It has been reported that attending to a particular location can modulate incoming sensory signals, as reflected by the stimulus-evoked P1 and N1 components of the visual event-related potential (ERPs) in a two-dimensional (2D) display [Attention, Space, and Action: Studies in Cognitive Neuroscience, Oxford University Press, New York, 1999, p. 31]. In contrast, in this study we examined the effect of attention in 3D space using a stereoscopic display. Stimuli were presented randomly, one at a time, in an orthogonal combination of two depths (near, far) and two 2D locations (left, right) relative to the fixation point. The task was to attend selectively to one of these four positions and to respond to a target stimulus defined by shape in the attended 3D location. The effect of 2D location selection on the P1 amplitude was greater for stimuli in the near than the far depth plane, and the amplitude of N1 increased in response to stimuli in the attended combination of 2D location and depth. These results suggest that the effect of early spatial selection on the visual ERP is not simply based on retinotopic organization of the visual field, but also on intermediate stages that construct a 3D spatial representation of the external world.
据报道，关注特定位置可以调节传入的感觉信号，二维（2D）显示中视觉事件相关电位（ERP）的刺激诱发P1和N1成分反映了这一点[《注意力、空间与行动：认知神经科学研究》，牛津大学出版社，纽约，1999年，第31页]。相比之下，在本研究中，我们使用立体显示来研究三维空间中注意力的影响。刺激以相对于注视点的两个深度（近、远）和两个二维位置（左、右）的正交组合随机呈现，一次一个。任务是选择性地关注这四个位置之一，并对在关注的三维位置由形状定义的目标刺激做出反应。对于近深度平面中的刺激，二维位置选择对P1振幅的影响大于远深度平面中的刺激，并且N1的振幅在对二维位置和深度的关注组合中的刺激做出反应时增加。这些结果表明，早期空间选择对视觉ERP的影响不仅基于视野的视网膜拓扑组织，还基于构建外部世界三维空间表征的中间阶段。
