Attention to locations and features: Different top-down modulation of detector weights
Attention to locations and features: Different top-down modulation of detector weights
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DOI：
10.1167/5.6.7
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Verghese, P
中科院分区：
文献类型：
--
作者：
Baldassi, S;Verghese, P
众所周知，注意力可以提高目标的可见度。在这项研究中，我们研究了注意力对目标选择性概况的影响。我们使用掩蔽技术来测量用于检测目标的调谐函数，同时提示其方向或位置。在存在方向掩模的情况下，无提示阈值在使用平行掩模时最大程度地升高，并随着目标的掩模方向的增加而降低。提示的存在减少了掩蔽效应，但功能的形状是特定于提示的：方向提示始终改善目标方向的阈值，而位置提示通常改善相对于在没有注意的情况下测量的功能的所有方向的阈值。在我们的研究中观察到的选择性相对于整体敏感性的增加可能是由于决定两种提示条件下的行为调整功能的各个检测器的权重差异所致。
It is well known that attention improves the visibility of a target. In this study, we examined the effect of attention on the selectivity profile for a target. We used a masking technique to measure the tuning function for detecting a target while cueing either its orientation or its location. In the presence of an orientation mask, uncued thresholds were maximally elevated with a parallel mask and decreased with increasing mask orientation from the target. The presence of a cue reduced the masking effect but the shape of the function was cue-specific: The orientation cue consistently improved thresholds at the target orientation, whereas the location cue typically improved thresholds at all orientations relative to the function measured in the absence of attention. The selective versus overall increase of sensitivity observed in our study may be due to differences in the weighting of individual detectors that determine the behavioral tuning function in the two cueing conditions.