Brouwer Gijs Joost, van Ee Raymond, Schwarzbach Jens
Helmholtz Institute, Utrecht University, 3584 CC Utrecht, The Netherlands.
J Neurosci. 2005 Nov 9;25(45):10403-13. doi: 10.1523/JNEUROSCI.2408-05.2005.
Using event-related functional magnetic resonance imaging, we studied the activation correlating with the awareness of stereoscopic depth using a bistable slanted surface (slant rivalry). Bistability resulted from incongruence between two slant-defining cues: binocular disparity and monocular perspective. The stimulus was perceived as alternating between the perspective-dominated percept (monocular depth) and the disparity-dominated percept (stereopsis), while sensory input remained constant, enabling us to study changes in awareness of depth associated with either cue. Transient activation relating to perceptual alternations was found bilaterally in the caudal part of the intraparietal sulcus, in the right-hemispheric anterior intraparietal sulcus, within visual area V4d-topo, and inferior to area MT+. Transient activation correlating specifically with alternations toward the disparity-dominated percept was found in a number of visual areas, including dorsal visual areas V3A, V7, and V4d-topo and visual areas MT+ and lateral occipital complex. No activation was found for alternations toward the perspective-dominated percept. Our results show that of all visual areas responsive to disparity-defined depth, V4d-topo shows the most robust signal changes correlating with the instigation of stereoscopic depth awareness (stereopsis).
我们使用事件相关功能磁共振成像技术，利用双稳态倾斜表面（倾斜竞争）研究了与立体深度感知相关的激活情况。双稳态源于两种定义倾斜的线索之间的不一致：双眼视差和单眼透视。在感觉输入保持不变的情况下，刺激被感知为在透视主导的感知（单眼深度）和视差主导的感知（立体视觉）之间交替，这使我们能够研究与任一线索相关的深度感知变化。在顶内沟尾部双侧、右半球前顶内沟、视觉区域V4d-topo内以及MT+区域下方发现了与感知交替相关的瞬时激活。在包括背侧视觉区域V3A、V7和V4d-topo以及视觉区域MT+和枕外侧复合体在内的多个视觉区域中发现了与向视差主导感知的交替特别相关的瞬时激活。对于向透视主导感知的交替未发现激活。我们的结果表明，在所有对视差定义深度有反应的视觉区域中，V4d-topo显示出与立体深度感知（立体视觉）激发最相关的强大信号变化。
