Brain Research Centre, Ankara University, Ankara, Turkey.
Department of Interdisciplinary Neuroscience, Health Science Institute, Ankara University, Ankara, Turkey.
Eur J Neurosci. 2019 Dec;50(11):3873-3888. doi: 10.1111/ejn.14537. Epub 2019 Sep 5.
Time sensitivity is affected by emotional stimuli such as fearful faces. The effect of threatening stimuli on time perception depends on numerous factors, including task type and duration range. We applied a two-interval forced-choice task using face stimuli to healthy volunteers to evaluate time perception and emotion interaction using functional magnetic resonance imaging. We conducted finite impulse response analysis to examine time series for the significantly activated brain areas and psycho-physical interaction to investigate the connectivity between selected regions. Time perception engaged a right-lateralised frontoparietal network, while a face discrimination task activated the amygdala and fusiform face area (FFA). No voxels were active with regard to the effect of expression (fearful versus neutral). In parallel with this, our behavioural results showed that attending to the fearful faces did not cause duration overestimation. Finally, connectivity of the amygdala and FFA to the middle frontal gyrus increased during the face processing condition compared to the timing task. Overall, our results suggest that the prefrontal-amygdala connectivity might be required for the emotional processing of facial stimuli. On the other hand, attentional load, task type and task difficulty are discussed as possible factors that influence the effects of emotion on time perception.
时间敏感性会受到情绪刺激的影响，例如恐惧的面孔。威胁刺激对时间感知的影响取决于许多因素，包括任务类型和持续时间范围。我们应用了一种使用面孔刺激的两间隔强制选择任务，使用功能磁共振成像评估时间感知和情绪相互作用。我们进行了有限脉冲响应分析，以检查显著激活的大脑区域的时间序列，并进行心理物理相互作用分析，以研究选定区域之间的连通性。时间感知涉及右侧额顶叶网络，而面孔辨别任务则激活了杏仁核和梭状回面孔区（FFA）。对于表情（恐惧与中性）的影响，没有激活体素。与此平行，我们的行为结果表明，注意恐惧的面孔不会导致时间估计过高。最后，与定时任务相比，在处理面孔的条件下，杏仁核和FFA 与额中回的连通性增加。总体而言，我们的结果表明，前额叶-杏仁核的连通性可能是对面部刺激进行情绪处理所必需的。另一方面，注意力负荷、任务类型和任务难度被认为是影响情绪对时间感知影响的可能因素。
