Neural substrates for expectation-modulated fear learning in the amygdala and periaqueductal gray.

Neural substrates for expectation-modulated fear learning in the amygdala and periaqueductal gray.
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DOI:
10.1038/nn.2594
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发表时间:
2010-08
影响因子:
25
通讯作者:
Blair, Hugh T.
Blair, Hugh T.
中科院分区:
医学1区
文献类型:
--
作者:
Johansen, Joshua P.;Tarpley, Jason W.;LeDoux, Joseph E.;Blair, Hugh T.

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当一个中性的条件刺激(CS)与一个令人厌恶的非条件刺激(US)配对时,一种被称为恐惧条件反射的厌恶动机学习形式就会发生。超声诱发的杏仁核神经元去极化可能指示赫布可塑性,储存记忆的CS-US协会,但美国输入到杏仁核的起源是未知的。理论和证据表明,当预期美国时,杏仁核的指导性美国输入将被抑制,但这在恐惧条件反射中尚未得到证明。在这里,我们研究了神经通路,美国信息传递到杏仁核记录在杏仁核和中脑导水管周围灰质(PAG)的神经元在恐惧条件反射。在杏仁核和PAG中的US诱发反应被期望抑制。PAG的药理学失活减弱了杏仁核中的US诱发反应,并损害了恐惧条件反射的获得,表明PAG可能是向杏仁核传递指导信号的途径的重要组成部分。
A form of aversively motivated learning called fear conditioning occurs when a neutral conditioned stimulus (CS) is paired with an aversive unconditioned stimulus (US). US-evoked depolarization of amygdala neurons may instruct Hebbian plasticity that stores memories of the CS-US association, but the origin of US inputs to the amygdala is unknown. Theory and evidence suggest that instructive US inputs to the amygdala will be inhibited when the US is expected, but this has not been demonstrated during fear conditioning. Here we investigated neural pathways that relay US information to the amygdala by recording neurons in the amygdala and periaqueductal gray (PAG) during fear conditioning. US-evoked responses in both amygdala and PAG were inhibited by expectation. Pharmacological inactivation of the PAG attenuated US-evoked responses in the amygdala and impaired acquisition of fear conditioning, indicating that PAG may be an important part of the pathway that relays instructive signals to the amygdala.
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