【作者】 夏丽荣； 徐升； 张宏伟； 高闯；

【Author】 Xia Lirong;Xu Sheng;Zhang Hongwie;Gao Chuang;School of psychology,central china normal university;

【机构】 华中师范大学心理学院；

【摘要】 立体知觉的产生,是视觉心理学领域一个重要而未决的问题。主要的立体知觉机制有单眼机制和双眼机制(主要是视差)。单眼缺口立体是一种很奇特的视觉现象——给双眼分别呈现带有缺口(gap)的平面图像时,人们会知觉到一个立体。本文探索单眼缺口立体的神经加工机制,以及单眼缺口立体与双眼视差立体的深度加工机制是否相同。本研究采用EEG技术,记录被试在观察单眼缺口立体、双眼视差立体与平面的脑电波,并利用ERP技术与偶极子溯源方法,分析和比较三类刺激的VEPs与溯源结果。发现:(1)关于P1与N1成分的波幅与潜伏期,三类刺激(单眼缺口立体、双眼视差立体、平面)的P1成分的潜伏期与波幅,以及N1的潜伏期均无显著差异,双眼视差立体的N1波幅在右脑比平面的显著要小,单眼缺口立体与双眼视差立体的N1成分的波幅在左右脑均无显著差异;(2)关于P2与N2成分的波幅与潜伏期,三类刺激的P2与N2的潜伏期均无显著差异,双眼视差立体与平面的P2成分波幅在左枕顶、枕颞叶区域有显著的差异,两者的N2成分波幅则在左枕顶区、枕颞区、与右枕颞区有显著差异,单眼缺口立体与双眼视差立体的P2与N2成分波幅均在左枕叶与右枕顶颞叶区域显著不同;(3)对单眼缺口和双眼视差立体,以及的双眼视差立体和平面的P2与N2时间窗(185-235ms)的差异波的BESA偶极子溯源分析,结果发现单眼缺口立体与双眼视差立体的差异波存在一个单偶极子源,偶极子粗略地定位于右中颞回(middle temporal gyrus),双眼视差立体与平面的差异波也存在一个单偶极子源,但偶极子粗略地定位于右楔叶(cuneus)。以上结果说明:(1)单眼缺口立体的早期加工机制与双眼视差立体相同,单眼缺口立体的匹配与深度加工可能和视差的匹配与计算的加工机制相同;(2)单眼缺口立体与双眼视差立体在知觉阶段的加工机制可能并不完全相同。更多还原

【Abstract】 How people produce stereoscopic perception is a important and unsolved problem in psychology of vision.And the mechanism of stereoscopic perception includes two main perspectives :monocular and binoculus.monocular gap stereopsis is an important and meaningful vision Phenomenon that present each eye with different planar graph could produce stereoscopic perception.To investigate neurophysiological correlates of monocular gap stereopsis and explore whether monocular gap and conventional binocular stereopsis share a common mechanism or not,the present study employ EEG technique by recording ofhuman visual evoked potentials(VEPs) from Three types of stimulus(monocular gap stereopsis,conventional binocular stereopsis,and flat) and dipole source analysis.And found :(a) P1/N1 amplitude and latency showed no significant difference between monocular gap and conventional binocular stereopsis,but N1 amplitude was significant smaller for conventional binocular stereopsis than flat,and(b) P2/N2 amplitude between monocular gap and conventional binocular stereopsis both showed significant difference in the left occipital and right temporo-parieto-occipital regions,and the significant difference of P2 amplitude between conventional binocular stereopsis and flat was in the left left occipito-parietal,occipito-temporal regions while the significant difference of N2 amplitude between them was in the left occipito-parietal,occipito-temporal regions and right occipito-temporal regions,and(c) the dipole source analysis of the difference wave of monocular gap and conventional binocular stereopsis in the P2 and N2 time window(185-235 ms) found a dipole was located in the right middle temporal gyrus,while the dipole of the difference wave of conventional binocular stereopsis and flat in the same time window was located in the right cuneus.These results are likely to suggest that depth perception of monocular gap stereopsis may share a common mechanism with conventional binocular stereopsis in the early visual processing,the correspondence processes and disparity calculation of monocular gap stereopsis may share a common mechanism with those of conventional binocular stereopsis,but the perceptual processes of monocular gap stereopsis may be difference from conventional binocular stereopsis.更多还原