Dynamic integration of information about salience and value for saccadic eye movements
Dynamic integration of information about salience and value for saccadic eye movements
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DOI：
10.1073/pnas.1115638109
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发表时间：
2012-05-08
影响因子：
11.1
通讯作者：
Gegenfurtner, Karl R.
中科院分区：
文献类型：
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作者：
Schuetz, Alexander C.;Trommershaeuser, Julia;Gegenfurtner, Karl R.
人类每秒会将目光转移到一个新的位置几次。目前还不清楚是什么决定了他们下一步的目标。注视行为不仅受到视觉刺激的低水平显著性（如亮度、对比度和颜色）的影响，而且还受到高水平任务需求和先验知识的影响。在自然条件下，不同的信息来源可能相互冲突，必须合并。在我们的范例中，我们权衡视觉显著性和期望值。我们发现，显着性和价值的信息影响扫视的终点内的对象，但具有不同的时间过程。显著性和价值的相对权重不是恒定的，而是随眼球运动而变化，这主要取决于在对扫视进行编程时价值信息的可用性。短潜伏期扫视主要由显著性决定，而长潜伏期扫视则考虑了价值信息。我们提出了一个模型，描述这些数据的动态加权和整合详细的地形图的视觉显着性和价值。这些结果支持视觉信息和价值处理的独立神经通路的概念。
Humans shift their gaze to a new location several times per second. It is still unclear what determines where they look next. Fixation behavior is influenced by the low-level salience of the visual stimulus, such as luminance, contrast, and color, but also by high-level task demands and prior knowledge. Under natural conditions, different sources of information might conflict with each other and have to be combined. In our paradigm, we trade off visual salience against expected value. We show that both salience and value information influence the saccadic end point within an object, but with different time courses. The relative weights of salience and value are not constant but vary from eye movement to eye movement, depending critically on the availability of the value information at the time when the saccade is programmed. Short-latency saccades are determined mainly by salience, but value information is taken into account for long-latency saccades. We present a model that describes these data by dynamically weighting and integrating detailed topographic maps of visual salience and value. These results support the notion of independent neural pathways for the processing of visual information and value.