Synchronization between the end stages of the dorsal and the ventral visual stream
Synchronization between the end stages of the dorsal and the ventral visual stream
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DOI：
10.1152/jn.00924.2010
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发表时间：
2011-05-01
影响因子：
2.5
通讯作者：
Janssen, Peter
中科院分区：
文献类型：
--
作者：
Verhoef, Bram-Ernst;Vogels, Rufin;Janssen, Peter
杨建军，杨建军，杨建军，等。背侧和腹侧视觉流的同步。中国生物医学工程学报（自然科学版），32(5):559 - 561。2011年2月16日首次出版；doi: 10.1152 / jn.00924.2010。-腹侧（IT）和背侧（AIP）视觉流的结束阶段区域编码差异定义的三维（3D）表面的形状。最近的解剖示踪研究发现，在IT和AIP的3d形状选择区域之间存在直接的相互联系。这些解剖连接是否用于促进3d形状感知仍然未知。我们同时记录了猴子在识别凹形和凸形三维形状时IT和AIP的多单元活动（MUA）和局部场电位，并测量了在任务过程中IT和AIP的活动同步程度。我们观察到，在刺激开始前，IT和AIP之间存在强烈的β -波段同步，在刺激开始后不久减弱，并在刺激期后期受到立体信号强度和刺激对比的调节。β相干调制与任务难度无关，具有区域特异性，并依赖于所研究的位点对的MUA选择性。AIP中的-峰场相干性预测了即将到来的猴子选择。几条趋同的证据线表明AIP是AIP- it同步活动的主要来源。同步的β活动似乎发生在感知预期和系统稳定到特定的感知状态时，而不是在活跃的视觉处理过程中。我们的研究结果首次证明，在3d形状识别过程中，背侧和腹侧流的结束阶段之间存在同步活动。
Verhoef B, Vogels R, Janssen P. Synchronization between the end stages of the dorsal and the ventral visual stream. J Neurophysiol 105: 2030-2042, 2011. First published February 16, 2011; doi:10.1152/jn.00924.2010.-The end stage areas of the ventral (IT) and the dorsal (AIP) visual streams encode the shape of disparity-defined three-dimensional (3D) surfaces. Recent anatomical tracer studies have found direct reciprocal connections between the 3D-shape selective areas in IT and AIP. Whether these anatomical connections are used to facilitate 3D-shape perception is still unknown. We simultaneously recorded multi-unit activity (MUA) and local field potentials in IT and AIP while monkeys discriminated between concave and convex 3D shapes and measured the degree to which the activity in IT and AIP synchronized during the task. We observed strong beta-band synchronization between IT and AIP preceding stimulus onset that decreased shortly after stimulus onset and became modulated by stereo-signal strength and stimulus contrast during the later portion of the stimulus period. The beta-coherence modulation was unrelated to task-difficulty, regionally specific, and dependent on the MUA selectivity of the pairs of sites under study. The beta-spike-field coherence in AIP predicted the upcoming choice of the monkey. Several convergent lines of evidence suggested AIP as the primary source of the AIP-IT synchronized activity. The synchronized beta activity seemed to occur during perceptual anticipation and when the system has stabilized to a particular perceptual state but not during active visual processing. Our findings demonstrate for the first time that synchronized activity exists between the end stages of the dorsal and ventral stream during 3D-shape discrimination.