Goal-related activity in V4 during free viewing visual search: Evidence for a ventral stream visual salience map
Goal-related activity in V4 during free viewing visual search: Evidence for a ventral stream visual salience map
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DOI：
10.1016/s0896-6273(03)00764-5
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发表时间：
2003-12-18
期刊：
影响因子：
16.2
通讯作者：
Gallant, JL
中科院分区：
文献类型：
--
作者：
Mazer, JA;Gallant, JL
复杂视觉场景的自然探索依赖于朝向重要位置的扫视眼球运动。眼跳定位被认为是介导的视网膜定位图，代表了显着特征的位置。在这份报告中，我们证明，外纹腹侧区V4包含一个retinotopic显着地图，引导探索性的眼球运动在一个自然的自由观看视觉搜索任务。在超过一半的记录细胞中，视觉驱动的活动在眼跳之前被增强，眼跳将中央凹移向先前由神经元的空间感受野占据的位置。这种相关性表明，V4中自下而上的处理影响了视力规划过程。一半的神经元也表现出自上而下的视觉反应的调制，这取决于搜索目标的身份，但不是视觉刺激。自下而上和自上而下的处理流在区域V4中的收敛导致显著性的自适应动态图，其在自然视觉期间指导视力规划。
Natural exploration of complex visual scenes depends on saccadic eye movements toward important locations. Saccade targeting is thought to be mediated by a retinotopic map that represents the locations of salient features. In this report, we demonstrate that extrastriate ventral area V4 contains a retinotopic salience map that guides exploratory eye movements during a naturalistic free viewing visual search task. In more than half of recorded cells, visually driven activity is enhanced prior to saccades that move the fovea toward the location previously occupied by a neuron's spatial receptive field. This correlation suggests that bottom-up processing in V4 influences the oculomotor planning process. Half of the neurons also exhibit top-down modulation of visual responses that depends on search target identity but not visual stimulation. Convergence of bottom-up and top-down processing streams in area V4 results in an adaptive, dynamic map of salience that guides oculomotor planning during natural vision.