Rhythm sequence through the olfactory bulb layers during the time window of a respiratory cycle
Rhythm sequence through the olfactory bulb layers during the time window of a respiratory cycle
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DOI：
10.1046/j.1460-9568.2003.02619.x
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发表时间：
2003-05-01
影响因子：
3.4
通讯作者：
Sicard, G
中科院分区：
文献类型：
--
作者：
Buonviso, N;Amat, C;Sicard, G
哺乳动物嗅球的特征是其局部场电位的显著振荡活动。呼吸是最重要的节奏。其他的节律也被描述在β和γ频率范围内。我们记录了单一的活动，在不同的延髓层，同时与当地的场电位，以检查之间存在的不同关系（i）呼吸和场电位振荡，（ii）呼吸和尖峰活动的不同类型的细胞。我们发现，无论层，气味引起的伽马振荡总是发生在吸气和呼气之间的过渡点，而β振荡出现在早期呼气，并可能延伸到吸气结束。相比之下，单一的活动表现出不同的特点，根据层。它们在以下方面不同：（i）它们相对于呼吸周期的时间关系;（ii）它们的尖峰频率;（iii）它们根据呼吸周期定义的时间模式。因此，呼吸周期的时间窗口可以基于场电位节律的减速（从γ振荡到β振荡）和范围从180 Hz到30 Hz的尖峰放电频率的同时梯度而被分成三个主要时期。我们讨论的可能性，每个节奏可以作为启动，门控或调谐的延髓网络不同的功能。
The mammalian olfactory bulb is characterized by prominent oscillatory activity of its local field potentials. Breathing imposes the most important rhythm. Other rhythms have been described in the beta- and gamma-frequency ranges. We recorded unitary activities in different bulbar layers simultaneously with local field potentials in order to examine the different relationships existing between (i) breathing and field potential oscillations, and (ii) breathing and spiking activity of different cell types. We show that, whatever the layer, odour-induced gamma oscillations always occur around the transition point between inhalation and exhalation while beta oscillations appear during early exhalation and may extend up to the end of inhalation. By contrast, unitary activities exhibit different characteristics according to the layer. They vary in (i) their temporal relationship with respect to the respiratory cycle; (ii) their spike rates; (iii) their temporal patterns defined according to the respiratory cycle. The time window of a respiratory cycle might thus be split into three main epochs based on the deceleration of field potential rhythms (from gamma to beta oscillations) and a simultaneous gradient of spike discharge frequencies ranging from 180 to 30 Hz. We discuss the possibility that each rhythm could serve different functions as priming, gating or tuning for the bulbar network.