Tuned normalization explains the size of attention modulations.

Tuned normalization explains the size of attention modulations.
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DOI:
10.1016/j.neuron.2012.01.006
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发表时间:
2012-02-23
期刊:
影响因子:
16.2
通讯作者:
Maunsell JH
Maunsell JH
中科院分区:
医学1区
文献类型:
--
作者:
Ni AM;Ray S;Maunsell JH

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The effect of attention on firing rates varies considerably within a single cortical area. The firing rate of some neurons is greatly modulated by attention while others are hardly affected. The reason for this variability across neurons is unknown. We found that the variability in attention modulation across neurons in area MT of macaques can be well explained by variability in the strength of tuned normalization across neurons. The presence of tuned normalization also explains a striking asymmetry in attention effects within neurons: when two stimuli are in a neuron’s receptive field, directing attention to the preferred stimulus modulates firing rates more than directing attention to the non-preferred stimulus. These findings show that much of the neuron-to-neuron variability in modulation of responses by attention depends on variability in the way the neurons process multiple stimuli, rather than differences in the influence of top-down signals related to attention.
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