Sharpe Melissa J, Killcross Simon
School of Psychology, University of New South Wales Australia, Kensington, New South Wales 2052, Australia
School of Psychology, University of New South Wales Australia, Kensington, New South Wales 2052, Australia.
Learn Mem. 2015 May 15;22(6):289-93. doi: 10.1101/lm.038273.115. Print 2015 Jun.
The prelimbic cortex is argued to promote conditioned fear expression, at odds with appetitive research implicating this region in attentional processing. Consistent with an attentional account, we report that the effect of prelimbic lesions on fear expression depends on the degree of competition between contextual and discrete cues. Further, when competition from contextual cues is low, we found that PL inactivation resulted in animals expressing fear toward irrelevant discrete cues; an effect selective to inactivation during the learning phase and not during retrieval. These data demonstrate that the prelimbic cortex modulates attention toward cues to preferentially direct fear responding on the basis of their predictive value.
有人认为,前边缘皮层会促进条件性恐惧的表达,这与将该区域与注意力加工联系起来的奖赏性研究不一致。与注意力理论相符的是,我们报告称,前边缘皮层损伤对恐惧表达的影响取决于情境线索和离散线索之间的竞争程度。此外,当来自情境线索的竞争较低时,我们发现前边缘皮层失活会导致动物对无关的离散线索表现出恐惧;这种效应在学习阶段而非检索阶段对失活具有选择性。这些数据表明,前边缘皮层会调节对线索的注意力,以便根据线索的预测价值优先引导恐惧反应。