Acetylcholine contributes through muscarinic receptors to attentional modulation in V1.

Acetylcholine contributes through muscarinic receptors to attentional modulation in V1.
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DOI:
10.1038/nature07141
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发表时间:
2008-08-28
期刊:
影响因子:
64.8
通讯作者:
Thiele, A.
Thiele, A.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Herrero, J. L.;Roberts, M. J.;Delicato, L. S.;Gieselmann, M. A.;Dayan, P.;Thiele, A.

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注意对皮质区域的神经元加工产生了强烈的影响。它有选择地提高发射速率并影响调谐属性,包括改变接收场的位置和尺寸。尽管对这些作用进行了充分的研究,但它们的细胞机制知之甚少。为了研究细胞机制,我们将胆碱能受体的离子疗法药理学分析与V1中的单细胞记录相结合,而恒河猴猕猴(Macaca Mulatta)则执行了一项要求自上而下的空间注意力的任务。研究正在研究的V1神经元的接受场导致发射率提高。在这里,我们表明,低剂量的乙酰胆碱可以增强这种注意调节。此外,施用毒蕈碱拮抗剂Scopolamine降低了注意力调节,而烟碱拮抗剂Mecamylamine没有系统的效应。这些结果表明,毒蕈碱胆碱能机制在介导V1中注意的影响方面起着核心作用。
Attention exerts a strong influence over neuronal processing in cortical areas. It selectively increases firing rates and affects tuning properties, including changing receptive field locations and sizes. Although these effects are well studied, their cellular mechanisms are poorly understood. To study the cellular mechanisms, we combined iontophoretic pharmacological analysis of cholinergic receptors with single cell recordings in V1 while rhesus macaque monkeys (Macaca mulatta) performed a task that demanded top-down spatial attention. Attending to the receptive field of the V1 neuron under study caused an increase in firing rates. Here we show that this attentional modulation was enhanced by low doses of acetylcholine. Furthermore, applying the muscarinic antagonist scopolamine reduced attentional modulation, whereas the nicotinic antagonist mecamylamine had no systematic effect. These results demonstrate that muscarinic cholinergic mechanisms play a central part in mediating the effects of attention in V1.
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