Amphetamine and extinction of cued fear.

Amphetamine and extinction of cued fear.
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DOI:
10.1016/j.neulet.2009.10.049
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发表时间:
2010-01-01
影响因子:
2.5
通讯作者:
Anagnostaras SG
Anagnostaras SG
中科院分区:
医学4区
文献类型:
--
作者:
Carmack SA;Wood SC;Anagnostaras SG

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许多研究都集中在开发改善记忆力的新药上。特别是,精神兴奋剂已被证明可以增强记忆力,并且在人类中具有长期的安全使用历史。在之前的工作中,我们已经证明,在进行巴甫洛夫恐惧条件反射任务训练之前给予非常低剂量的安非他明可以显著促进线索恐惧的获得。目前的实验试图将这些发现扩展到线索恐惧的消失,这是一个众所周知的范例,对习得性恐惧症和创伤后应激障碍具有治疗意义。如果消退反映了新的学习,人们可能会认为,增强获得线索恐惧的药物也会增强线索恐惧的消退。这个实验检查了0.005或0.05毫克/公斤的d-安非他明(治疗剂量显示,以提高收购)是否也提高了消失的线索恐惧。与我们的假设相反,安非他明并没有加速灭绝。因此,在增强条件性恐惧获得的剂量下,安非他明似乎不会增强灭绝。
Much research is focused on developing novel drugs to improve memory. In particular, psychostimulants have been shown to enhance memory and have a long history of safe use in humans. In prior work, we have shown that very low doses of amphetamine administered before training on a Pavlovian fear-conditioning task can dramatically facilitate the acquisition of cued fear. The current experiment sought to expand these findings to the extinction of cued fear, a well-known paradigm with therapeutic implications for learned phobias and post-traumatic stress disorder. If extinction reflects new learning, one might expect drugs that enhance the acquisition of cued fear to also enhance the extinction of cued fear. This experiment examined whether 0.005 or 0.05 mg/kg of d-amphetamine (therapeutic doses shown to enhance acquisition) also enhance the extinction of cued fear. Contrary to our hypothesis, amphetamine did not accelerate extinction. Thus, at doses that enhance acquisition of conditioned fear, amphetamine does not appear to enhance extinction.
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