Ameliorating the combinatorial explosion with spatial frequency-matched combinations of V1 outputs.
Ameliorating the combinatorial explosion with spatial frequency-matched combinations of V1 outputs.
复制标题
通过 V1 输出的空间频率匹配组合改善组合爆炸。
作者：
S. Hancock;David P. McGovern;J. Peirce
人们对早期方向选择神经元的输出如何组合的方式知之甚少。一个特殊的问题是这些输出的可能组合的数量大大超过了可用于表示它们的处理单元的数量。在这里，我们考虑视觉系统可以减少该问题影响的两种可能方式。首先，视觉系统可以通过折叠先前处理阶段编码的一些低级特征（例如空间频率）来改善问题。其次，视觉系统可能仅组合可用输出的子集，例如具有相似感受野特征的输出。使用格子选择性对比度适应和曲率后效应，我们没有发现前一种解决方案的证据；两种后效应都明显调整到适配器相对于测试探针的空间频率。然而，我们确实找到了后者具有两种后果的证据。当形成复合刺激的成分在空间频率上不同时，适应它们的效果就会大大降低。这对于中级视觉处理具有重要意义，无论是对于组合爆炸还是对于被感知为来自单个视觉对象的共同特征的选择性“绑定”。
Little is known about the way in which the outputs of early orientation-selective neurons are combined. One particular problem is that the number of possible combinations of these outputs greatly outweighs the number of processing units available to represent them. Here we consider two of the possible ways in which the visual system might reduce the impact of this problem. First, the visual system might ameliorate the problem by collapsing across some low-level feature coded by previous processing stages, such as spatial frequency. Second, the visual system may combine only a subset of available outputs, such as those with similar receptive field characteristics. Using plaid-selective contrast adaptation and the curvature aftereffect, we found no evidence for the former solution; both aftereffects were clearly tuned to the spatial frequency of the adaptor relative to the test probe. We did, however, find evidence for the latter with both aftereffects; when the components forming our compound stimuli were dissimilar in spatial frequency, the effects of adapting to them were substantially reduced. This has important implications for mid-level visual processing, both for the combinatorial explosion and for the selective "binding" of common features that are perceived as coming from a single visual object.
登录
查看更多内容
影响因子：
3.7
作者：
Felleman, Daniel J.;Van Essen, David C.
通讯作者：
Van Essen, David C.
影响因子：
56.9
作者：
GALLANT, JL;BRAUN, J;VANESSEN, DC
通讯作者：
VANESSEN, DC
影响因子：
2.5
作者：
Gallant, JL;Connor, CE;VanEssen, DC
通讯作者：
VanEssen, DC
影响因子：
1.8
作者：
Peirce, Jonathan W.
通讯作者：
Peirce, Jonathan W.
影响因子：
2.5
作者：
Pasupathy, A;Connor, CE
通讯作者：
Connor, CE