Fear and safety engage competing patterns of theta-gamma coupling in the basolateral amygdala.

Fear and safety engage competing patterns of theta-gamma coupling in the basolateral amygdala.
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DOI:
10.1016/j.neuron.2014.07.026
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发表时间:
2014-08-20
期刊:
影响因子:
16.2
通讯作者:
Gordon JA
Gordon JA
中科院分区:
医学1区
文献类型:
--
作者:
Stujenske JM;Likhtik E;Topiwala MA;Gordon JA

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Theta振荡在恐惧表达时使杏仁基底外侧核(BLA)与海马区(HPC)和内侧前额叶皮质(MPFC)同步。伽马频率振荡在血乳酸中的作用还没有得到很好的描述。我们检测了在恐惧条件作用、消退和暴露在开阔的场下时,来自BLA-HPC-mPFC回路的神经活动记录中的伽马和西塔频率活动。在BLA中,慢(40-70赫兹)和快(70-120赫兹)伽马振荡与theta周期的不同阶段相耦合,反映了同步的高频单位活动。在恐惧时期,血乳酸-快速伽马偶联增强,而快速伽马能力受到抑制。相对安全的时期与增强的BLA快速伽马能力、mPFC到BLA的方向性以及BLA伽马与mPFC theta的强烈耦合有关。这些发现表明,恐惧和安全状态之间的转换是由血乳酸伽马偶联到竞争性theta频率输入的变化所调节的。
Theta oscillations synchronize the basolateral amygdala (BLA) with the hippocampus (HPC) and medial prefrontal cortex (mPFC) during fear expression. The role of gamma-frequency oscillations in the BLA is less well characterized. We examined gamma- and theta-frequency activity in recordings of neural activity from the BLA-HPC-mPFC circuit during fear conditioning, extinction, and exposure to an open field. In the BLA, slow (40-70 Hz) and fast (70-120 Hz) gamma oscillations were coupled to distinct phases of the theta cycle and reflected synchronous high frequency unit activity. During periods of fear, BLA theta-fast gamma coupling was enhanced, while fast gamma power was suppressed. Periods of relative safety were associated with enhanced BLA fast gamma power, mPFC-to-BLA directionality, and strong coupling of BLA gamma to mPFC theta. These findings suggest that switches between states of fear and safety are mediated by changes in BLA gamma coupling to competitive theta frequency inputs.
杏仁核活动的前额叶夹带标志着学识渊博的恐惧和天生焦虑中的安全性。
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