Allocation of attention during pursuit of large objects is no different than during fixation.
Allocation of attention during pursuit of large objects is no different than during fixation.
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DOI：
10.1167/15.9.9
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发表时间：
2015-07
影响因子：
1.8
通讯作者：
S. Watamaniuk;S. Heinen
中科院分区：
文献类型：
--
作者：
S. Watamaniuk;S. Heinen
注意在追踪过程中的分配通常是不对称的，即更多的注意被放在目标的前方而不是后方，然而，注意在更大的追踪刺激上是对称分配的。一个尚未解决的问题是，在追求过程中，注意力在多大程度上受到大刺激的约束。虽然一些工作表明它是紧紧地锁定到中央凹，其他工作表明它是灵活的分配。为了研究这一点，我们让观察者对由5个、9个或15个字符组成的大的追踪刺激进行字符识别任务，这些字符的间距在0.6°到4.0°之间。最初，角色是相同的，但在一个随机的时间，他们都短暂地改变，使其中一个独特的。观察员确定了独特的特征。与以前的文献一致，注意力出现狭窄和对称的追求目标的紧密间隔（0.6°）的字符。增加间距极大地扩大了注意范围，可能是通过缓解拥挤。然而，当我们控制拥挤时，性能受到集合大小的限制，对偏心目标的影响更大。有趣的是，同样的限制注意力分配观察固定和追求刺激的证据表明，注意力的运作类似于固定和追求的刺激，延伸到周边。结果表明，注意力是灵活分配在追求，但性能是有限的拥挤和集大小。此外，执行识别任务并没有损害追求性能，进一步证明追求大的刺激是相对不注意的。
Attention allocation during pursuit of a spot is usually characterized as asymmetric with more attention placed ahead of the target than behind it. However, attention is symmetrically allocated across larger pursuit stimuli. An unresolved issue is how tightly attention is constrained on large stimuli during pursuit. Although some work shows it is tightly locked to the fovea, other work shows it is allocated flexibly. To investigate this, we had observers perform a character identification task on large pursuit stimuli composed of arrays of five, nine, or 15 characters spaced between 0.6° and 4.0° apart. Initially, the characters were identical, but at a random time, they all changed briefly, rendering one of them unique. Observers identified the unique character. Consistent with previous literature, attention appeared narrow and symmetric around the pursuit target for tightly spaced (0.6°) characters. Increasing spacing dramatically expanded the attention scope, presumably by mitigating crowding. However, when we controlled for crowding, performance was limited by set size, suffering more for eccentric targets. Interestingly, the same limitations on attention allocation were observed with stationary and pursued stimuli-evidence that attention operates similarly during fixation and pursuit of a stimulus that extends into the periphery. The results suggest that attention is flexibly allocated during pursuit, but performance is limited by crowding and set size. In addition, performing the identification task did not hurt pursuit performance, further evidence that pursuit of large stimuli is relatively inattentive.