Psychophysical evidence for contraction of the range of spatial integration as a mechanism for filtering out spatial noise in a random dot motion display
Psychophysical evidence for contraction of the range of spatial integration as a mechanism for filtering out spatial noise in a random dot motion display
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空间积分范围收缩作为过滤随机点运动显示中空间噪声的机制的心理物理学证据
DOI：
10.1016/j.visres.2011.07.011
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发表时间：
2011
期刊：
影响因子：
1.8
通讯作者：
Uka T
中科院分区：
文献类型：
--
作者：
Sasaki R;Uka T
人类的判断力经常受到横跨我们视野的分心因素的影响。如何从复杂场景中的空间受限区域中提取相关信息，而不考虑这种损伤，是视觉领域的一个重要问题。最近，有研究表明，通过增加周围干扰物的数量而不改变密度，从而增加干扰物覆盖的总面积，可以减少这种损害。然而，人们对其潜在机制知之甚少(S)。在这里，我们检验了一种假设，即分心物造成的视觉损害是由于跨空间整合无关信息所致，并且进一步添加分心物会导致空间整合场的收缩。受试者被指示判断中心盘内的运动方向，并在随机点运动图中忽略周围环上的运动噪声。我们观察到环带大小的非单调效应，受试者的辨别阈值随着环带大小的增大而先增加后减小。我们进一步研究了周围环中的微弱相干运动如何干扰受试者的表现。重要的是，我们发现干扰的量随着周围运动噪声的增加而减少，这与干扰物的添加导致空间整合范围的收缩的假设是一致的。我们的结果表明，视觉感受野内的整合会导致整个视野内分心因素造成的损害，而整合范围的收缩可以抵消这种损害。
Human judgment is frequently impaired by distracters extending across our field of view. How we extract relevant information from a spatially restricted region in a complex scene in spite of this impairment is an important issue in vision. Recently, it has been shown that this impairment can be reduced by increasing the number of surrounding distracters without changing the density, thus increasing the total area covered by the distracters. Little, however, is known regarding the underlying mechanism(s). Here, we tested the hypothesis that visual impairment by distracters is due to integration of irrelevant information across space, and that further addition of distracters produces contraction of the spatial integration field. Human subjects were instructed to judge the direction of motion within a center disk and to ignore motion noise in the surrounding annulus in a random dot kinematogram. We observed a non-monotonic effect of the size of the annulus, in which the subjects’ discrimination thresholds at first increased, and then decreased as the size of the annulus became larger. We further investigated how weak coherent motion in the surrounding annulus interferes with the subjects’ performance. Importantly, we found that the amount of interference decreases with the addition of surrounding motion noise, consistent with the hypothesis that the addition of distracters produces contraction of the range of spatial integration. Our results suggest that integration within a visual receptive field causes impairment by distracters across our visual field, and that contraction of the range of integration can counteract this impairment.