Corbett Brittany, Rajah M Natasha, Duarte Audrey
School of Psychology, Center for Advanced Brain Imaging, Georgia Institute of Technology, Atlanta, GA, USA.
Brain Imaging Centre, Douglas Mental Health University Institute, Verdun, QC, Canada.
Cereb Cortex. 2020 Mar 14;30(3):1291-1306. doi: 10.1093/cercor/bhz166.
Previous studies have only investigated age-related differences in emotional processing and encoding in response to, not in anticipation of, emotional stimuli. In the current study, we investigated age-related differences in the impact of emotional anticipation on affective responses and episodic memory for emotional images. Young and older adults were scanned while encoding negative and neutral images preceded by cues that were either valid or invalid predictors of image valence. Participants were asked to rate the emotional intensity of the images and to complete a recognition task. Using multivariate behavioral partial least squares (PLS) analysis, we found that greater anticipatory recruitment of the amygdala, ventromedial prefrontal cortex (vmPFC), and hippocampus in older adults predicted reduced memory for negative than neutral images and the opposite for young adults. Seed PLS analysis further showed that following negative cues older adults, but not young adults, exhibited greater activation of vmPFC, reduced activation of amygdala, and worse memory for negative compared with neutral images. To the best of our knowledge, this is the first study to provide evidence that the "positivity effect" seen in older adults' memory performance may be related to the spontaneous emotional suppression of negative affect in anticipation of, not just in response to, negative stimuli.
以往的研究仅调查了在对情绪刺激做出反应而非预期时,情绪加工和编码中与年龄相关的差异。在本研究中,我们调查了情绪预期对情绪图像的情感反应和情景记忆的影响中与年龄相关的差异。在对负性和中性图像进行编码时,对年轻和年长成年人进行了扫描,图像之前的线索是图像效价的有效或无效预测指标。要求参与者对图像的情绪强度进行评分并完成一项识别任务。使用多变量行为偏最小二乘法(PLS)分析,我们发现年长成年人杏仁核、腹内侧前额叶皮层(vmPFC)和海马体更大的预期性激活预示着对负性图像的记忆比对中性图像的记忆减少,而年轻成年人则相反。种子PLS分析进一步表明,在呈现负性线索后,年长成年人而非年轻成年人,与中性图像相比,vmPFC表现出更大的激活,杏仁核激活减少,对负性图像的记忆更差。据我们所知,这是第一项提供证据表明,在年长成年人记忆表现中看到的“积极效应”可能与在预期而非仅仅是对负性刺激做出反应时对负性情绪的自发抑制有关的研究。