Neural circuit mechanisms for pattern detection and feature combination in olfactory cortex.

Neural circuit mechanisms for pattern detection and feature combination in olfactory cortex.
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DOI:
10.1016/j.neuron.2011.02.047
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发表时间:
2011-04-14
期刊:
影响因子:
16.2
通讯作者:
Ehlers MD
Ehlers MD
中科院分区:
医学1区
文献类型:
--
作者:
Davison IG;Ehlers MD

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气味最初在大脑中被编码为一组不同的物理化学特征,但最终被感知为一个统一的感官对象--“气味”。目前尚不清楚不同气味受体和主嗅球(MOB)中分离的肾小球所编码的化学特征是如何组装成完整的皮质表征的。结合对MOB的模式光学微刺激和梨状前皮质(PCX)的在体电生理记录,我们评估了皮质神经元如何解码分布在MOB肾小球的复杂活动模式。PCX放电对单球的光刺激不敏感。相反,个别细胞报告了类似于气味诱发感觉图的协同作用肾小球的更高级别的组合。细胞内记录显示了一个相应的电路结构,为每个皮质神经元提供来自不同的MOB肾小球亚群的弱突触输入。因此,PCX神经元检测特定的肾小球集合,提供化学特征组合的明确神经表示,这些组合是复杂气味刺激的标志。
Odors are initially encoded in the brain as a set of distinct physicochemical characteristics, but are ultimately perceived as a unified sensory object – a ‘smell’. It remains unclear how chemical features encoded by diverse odorant receptors and segregated glomeruli in the main olfactory bulb (MOB) are assembled into integrated cortical representations. Combining patterned optical microstimulation of MOB with in vivo electrophysiological recordings in anterior piriform cortex (PCx), we assessed how cortical neurons decode complex activity patterns distributed across MOB glomeruli. PCx firing was insensitive to single-glomerulus photostimulation. Instead, individual cells reported higher-order combinations of coactive glomeruli resembling odor-evoked sensory maps. Intracellular recordings revealed a corresponding circuit architecture providing each cortical neuron with weak synaptic input from a distinct subpopulation of MOB glomeruli. PCx neurons thus detect specific glomerular ensembles, providing an explicit neural representation of chemical feature combinations that are the hallmark of complex odor stimuli.
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