Selective dorsal and ventral processing: Evidence for a common attentional mechanism in reaching and perception
Selective dorsal and ventral processing: Evidence for a common attentional mechanism in reaching and perception
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DOI：
10.1080/713756776
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发表时间：
1998-03-01
期刊：
影响因子：
2
通讯作者：
Paprotta, I
中科院分区：
文献类型：
--
作者：
Deubel, H;Schneider, WX;Paprotta, I
灵长类动物的视觉系统可以分为腹侧流和背侧流，腹侧流用于感知和识别，背侧流用于计算运动动作的空间信息。如何协调两个加工流程中的选择机制？我们最近证明了腹侧流中的感知选择（通常称为“视觉注意”）和背侧流中的眼跳目标选择是紧密耦合的（Deubel & Schneider，1996）。在这里，我们调查这种耦合是否也适用于准备手动达到运动。一个双任务范式需要准备一个达到运动的线索项目在一个字母串。同时，区分周围干扰物中速示呈现的符号“E”和“There Exists”的能力被视为感知表现的衡量标准。数据表明，当辨别刺激也是手动瞄准的目标时，辨别性能是上级的;当辨别刺激和指向目标指的是不同的对象时，性能恶化。因此，不可能为了辨别的目的而保持对刺激的注意力，同时将运动引导到空间上分离的对象。结果认为一个强制性的耦合（腹侧）选择知觉和（背侧）选择行动。
The primate visual system can be divided into a ventral stream for perception and recognition and a dorsal stream for computing spatial information for motor action. How are selection mechanisms in both processing streams coordinated? We recently demonstrated that selection-for-perception in the ventral stream (usually termed "visual attention") and saccade target selection in the dorsal stream are tightly coupled (Deubel & Schneider, 1996). Here we investigate whether such coupling also holds for the preparation of manual reaching movements. A dual-task paradigm required the preparation of a reaching movement to a cued item in a letter string. Simultaneously, the ability to discriminate between the symbols "E" and "There Exists" presented tachistoscopically within the surrounding distracters was taken as a measure of perceptual performance. The data demonstrate that discrimination performance is superior when the discrimination stimulus is also the target for manual aiming; when the discrimination stimulus and pointing target refer to different objects, performance deteriorates. Therefore, it is not possible to maintain attention on a stimulus for the purpose of discrimination while directing a movement to a spatially separate object. The results argue for an obligatory coupling of (ventral) selection-for-perception and (dorsal) selection-for-action.