Feature synergy depends on feature contrast and objecthood
Feature synergy depends on feature contrast and objecthood
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DOI：
10.1016/j.visres.2004.04.002
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发表时间：
2004-07-01
期刊：
影响因子：
1.8
通讯作者：
Röers, B
中科院分区：
文献类型：
--
作者：
Meinhardt, G;Schmidt, M;Röers, B
对纹理的数字，定义的空间频率，方向或两个线索（冗余纹理定义）的对比度必须在一个均匀的伽柏场检测。在符合预期，我们发现更好的检测性能的安排，具有较高的特征对比度沿着边界的数字邻接。冗余定义的数字显示协同作用，一个显着的性能增加相比，独立处理的方向和空间频率线索的预测。如在先前的研究中发现的[Spatial Vision 16（2003）459; Vision Research（提交出版）]，这种性能优势与可见度呈负相关。特别是，具有高边界特征对比度的数字很容易检测到，但显示出弱的协同作用，而具有低边界特征对比度的数字几乎检测不到，但显着受益于冗余纹理定义。更仔细的分析表明，图形的形式也是至关重要的：只要它们保持清晰的二维形状，协同效应只会受到图形大小和边框长度变化的轻微影响。但是当它们退化到一维Gabor单元阵列时，协同作用几乎完全消失。结果表明，这两个因素，低可见性和客观性，是功能协同的关键。我们的结论是，促进跨功能域服务于隔离图从地面时，从一个单一的域的信号太弱，使物体检测和消失的条件下，稳定的目标视觉。(C)2004 Elsevier Ltd.保留所有权利。
Pairs of texture figures, defined by contrast in spatial frequency, orientation or both cues (redundant texture definition) had to be detected within a homogeneous Gabor field. In line with expectation we find better detection performance for arrangements with higher feature contrast along the border where the figures abut. Redundantly defined figures show synergy, a significant performance increase compared to the prediction of independent processing of orientation and spatial frequency cues. As found in previous studies [Spatial Vision 16 (2003) 459; Vision Research (submitted for publication)] this performance advantage is negatively correlated with visibility. In particular, figures with high border feature contrast are easily detectable but show weak synergy whereas figures with low border feature contrast are barely detectable but remarkably benefit from redundant texture definition. Closer analysis reveals that the form of the figures is also crucial: As long as they maintain a clear two dimensional shape the synergy effect is only marginally affected by variation figure size and border length. But when they degrade to one dimensional Gabor element arrays, synergy almost completely vanishes. The results imply that both factors, low visibility and objecthood, are critical for feature synergy. We conclude that facilitation across feature domains serves to segregate figure from ground when the signal from a single domain is too weak to enable object detection and vanishes under conditions of stable object vision. (C) 2004 Elsevier Ltd. All rights reserved.