Olfactory cortical neurons read out a relative time code in the olfactory bulb.

Olfactory cortical neurons read out a relative time code in the olfactory bulb.
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DOI:
10.1038/nn.3407
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发表时间:
2013-07
影响因子:
25
通讯作者:
Uchida, Naoshige
Uchida, Naoshige
中科院分区:
医学1区
文献类型:
--
作者:
Haddad, Rafi;Lanjuin, Anne;Madisen, Linda;Zeng, Hongkui;Murthy, Venkatesh N.;Uchida, Naoshige

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气味刺激在嗅球中引发复杂的时空活动,这表明被激活神经元的特性以及它们活动的时间传递了有关气味的信息。然而,下游神经元是否以及如何解读这些时间模式仍存在争议。我们通过在小鼠中用光遗传学方法以不同的相对时间刺激嗅球中的两个焦点,同时测量下游神经元的放电活动来解决这个问题。我们发现梨状皮质神经元的总体放电率对激活的相对时间敏感。梨状皮质后部的神经元对相对输入时间比梨状皮质前部的神经元表现出更高的敏感性。相比之下,嗅球神经元很少表现出这种敏感性。因此,大脑能够将外周的相对时间编码转换为中枢脑区基于放电率的表征,为嗅球中基于相对时间的编码的相关性提供了证据。
Odor stimulation evokes complex spatiotemporal activity in the olfactory bulb, suggesting that the identity of activated neurons as well as the timing of their activity convey information about odors. However, whether and how downstream neurons decipher these temporal patterns remains debated. We addressed this question by measuring the spiking activity of downstream neurons while optogenetically stimulating two foci in the olfactory bulb with varying relative timing in mice. We found that the overall spike rates of piriform cortex neurons were sensitive to the relative timing of activation. Posterior piriform cortex neurons showed higher sensitivity to relative input times than neurons in the anterior piriform cortex. In contrast, olfactory bulb neurons rarely showed such sensitivity. Thus, the brain can transform a relative time code in the periphery into a firing-rate-based representation in central brain areas, providing evidence for the relevance of relative time-based code in the olfactory bulb.
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