Additive effects of attention and stimulus contrast in primary visual cortex.

Additive effects of attention and stimulus contrast in primary visual cortex.
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DOI:
10.1093/cercor/bhp070
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发表时间:
2009-12
期刊:
Cerebral cortex (New York, N.Y. : 1991)
影响因子:
--
通讯作者:
Roelfsema PR
Roelfsema PR
中科院分区:
其他
文献类型:
--
作者:
Thiele A;Pooresmaeili A;Delicato LS;Herrero JL;Roelfsema PR

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先前的研究已经提出了多种注意力影响神经元活动的机制。在这里,我们研究了猴子在不同刺激对比度下执行基于空间或基于物体的注意力任务时,纹状皮质中注意力的机制,并比较了有注意力和无注意力时神经元的对比度反应函数。我们的数据最好用一种“相加性”相互作用来描述:注意力对神经元反应的影响相对独立于刺激对比度,至少当刺激具有足够的对比度变得可见时是如此。这表明注意力以一种在很大程度上与对比度无关的方式增加神经元反应。这些数据支持了近期的功能性磁共振成像研究,并表明来自高级区域的反馈施加了一种恒定的注意力驱动,这种驱动主要是由任务而非刺激驱动的。
Previous studies have proposed a variety of mechanisms by which attention influences neuronal activity. Here we investigated the mechanisms of attention in the striate cortex of monkeys performing a spatial or an object-based attention task at various stimulus contrasts and compared neuronal contrast response functions with and without attention. Our data are best described by an “additive” interaction: The influence of attention on the neuronal response is relatively independent of the stimulus contrast, at least when the stimulus has enough contrast to become visible. This shows that attention adds to the neuronal responses in a largely contrast invariant manner. These data support recent functional magnetic resonance imaging studies and suggest that feedback from higher areas exerts a constant attentional drive that is mostly task not stimulus driven.
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期刊: NEURON
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