Phasic vs sustained fear in rats and humans: role of the extended amygdala in fear vs anxiety.
Phasic vs sustained fear in rats and humans: role of the extended amygdala in fear vs anxiety.
复制标题
在大鼠和人类中持续的恐惧:恐惧与焦虑中的杏仁核的作用。
DOI:
10.1038/npp.2009.109
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发表时间:
2010-01
期刊:
影响因子:
--
通讯作者:
中科院分区:
文献类型:
--
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Data will be reviewed using the acoustic startle reflex in rats and humans based on our attempts to operationally define fear vs anxiety. Although the symptoms of fear and anxiety are very similar, they also differ. Fear is a generally adaptive state of apprehension that begins rapidly and dissipates quickly once the threat is removed (phasic fear). Anxiety is elicited by less specific and less predictable threats, or by those that are physically or psychologically more distant. Thus, anxiety is a more long-lasting state of apprehension (sustained fear). Rodent studies suggest that phasic fear is mediated by the amygdala, which sends outputs to the hypothalamus and brainstem to produce symptoms of fear. Sustained fear is also mediated by the amygdala, which releases corticotropin-releasing factor, a stress hormone that acts on receptors in the bed nucleus of the stria terminalis (BNST), a part of the so-called ‘extended amygdala.’ The amygdala and BNST send outputs to the same hypothalamic and brainstem targets to produce phasic and sustained fear, respectively. In rats, sustained fear is more sensitive to anxiolytic drugs. In humans, symptoms of clinical anxiety are better detected in sustained rather than phasic fear paradigms.
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