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.
复制标题
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
中科院分区:
文献类型:
--
作者:
Ling S;Liu T;Carrasco M
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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