How spatial and feature-based attention affect the gain and tuning of population responses.

How spatial and feature-based attention affect the gain and tuning of population responses.
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空间和基于特征的注意力如何影响人口反应的增益和调整。

DOI:
10.1016/j.visres.2008.05.025
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发表时间:
2009-06
期刊:
影响因子:
1.8
通讯作者:
Carrasco M
Carrasco M
中科院分区:
心理学3区
文献类型:
--
作者:
Ling S;Liu T;Carrasco M

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注意力是如何优化我们的视觉系统来完成手头的任务的?关于注意力如何改善信号处理,提出了两种机制:增益和调谐。为了区分这两种机制,我们使用等效噪声范式,将性能作为外部噪声的函数来衡量。在本研究中,我们通过评估基于空间和特征的注意力对增益和调谐的特征行为效应的阈值-噪声(TvN)曲线,探讨了它们如何影响表现。此外,我们通过实施一个简单的、生物学上合理的模型,将我们的心理物理学结果与神经生理学联系起来,以表明注意对群体反应的增益和调整的影响是不同的,这取决于所部署的注意的类型:空间注意通过提高群体反应的增益来起作用,而基于特征的注意通过提高群体反应的增益和调整来起作用。
How does attention optimize our visual system for the task at hand? Two mechanisms have been proposed for how attention improves signal processing: gain and tuning. To distinguish between these two mechanisms we use the equivalent-noise paradigm, which measures performance as a function of external noise. In the present study we explored how spatial and feature-based attention affect performance by assessing their threshold-vs-noise (TvN) curves with regard to the signature behavioral effects of gain and tuning. Furthermore, we link our psychophysical results to neurophysiology by implementing a simple, biologically-plausible model to show that attention affects the gain and tuning of population responses differentially, depending on the type of attention being deployed: Whereas spatial attention operates by boosting the gain of the population response, feature-based attention operates by both boosting the gain and sharpening the tuning of the population response.
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