Depth Perception In Cue Conflict And The Mechanism Of Perception Filling-In

The integration of depth cues is a fundmental issue in cognitive psychology. Using behavioral paradigm with EEG technique, the present research is focusing on the early stage of dynamic integration of depth cues, cue conflict, filling-in phenomena in 3D scene and their brain mechanisms. Three experiments were conducted to find out the interaction processing in cue conflict and the interaction between "top-down" and "bottom-up" information flows in 3D filling-in phenomena.Main conclusions of the paper are as following:(1) In the early stage of cue conflict, the texture: gradients and discontinuity disparity cues were averaged. When exposure time was increased, the weighting of texture gradients was decreased while the weighting of disparity increased.(2) When linear perspective cue conflicted with discontinuity disparity, most of subjects used cue dominant strategy. Forming the cue dominance was influenced by the efficiency processing in disparity-alone and perspective-alone.(3) Different cue integration strategies were used in different cue combinations. The integration of textures gradients and disparity may fit into a modified weak fusion model, while Beyesian model would be better in perspective and disparity cue conflict.(4) Disparity induced a large N2 in occipital region. The latency of N2 varies between 150ms and 250ms, which was affected by textures gradients and linear perspective. In the conflict of disparity and texture gradients, disparity also induced a long-rang slow wave in frontal-parietal region about 600-800ms.(5) Coherence analysis showed, there were different synchronizations in α,β1,β2. In segments recognition of Chinese character (Chapter 4), different regions connected with occipital region most with α wave synchronization, while temporal region connected with other regions most with β wave. There were interactions between occlusion and disparity, occlusion and color in β wave synchronization. The β wave synchronization will bring forward in occlusion condition.(6) Occlusion caused filling-in phenomena. Filling-in would be occurred in different depth and different color surface segments. Filling-in processing would preempt access to space-based grouping cues.