Brain activation underlying threat detection to targets of different races.
Brain activation underlying threat detection to targets of different races.
复制标题
大脑激活的基础威胁检测到不同种族的目标。
DOI：
10.1080/17470919.2015.1091380
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发表时间：
2015
影响因子：
2
通讯作者：
Ito TA
中科院分区：
文献类型：
--
作者：
Senholzi KB;Depue BE;Correll J;Banich MT;Ito TA
目前的研究检查了血氧水平依赖（BOLD）信号在威胁检测中的种族差异。在功能磁共振成像过程中，参与者确定黑人或白人的照片是否持有武器。他们被要求对有武装的人做出射击反应，但对没有武装的人不射击反应，不射击有武装的人的代价大于射击没有武装的人的代价。参与者对持枪黑人的射击速度比白人快，但对手无寸铁白人的“不要开枪”反应比黑人快。根据目标种族的不同，武装和非武装目标的大脑活动有所不同，这表明威胁与安全决策背后的不同机制。未携带武器的白人比黑人更容易被前扣带皮层激活。持有武器的黑人的顶叶和视觉皮层区域比白人表现出更大的活动。以种子为基础的杏仁核功能连通性显示，武装黑人与白人相比，与顶叶和视觉皮层有更大的一致性。此外，与携带武器的白人相比，携带武器的黑人的杏仁核激活增加与更大的隐性黑-危险关联有关。我们的研究结果表明，不同的神经机制可能是种族对武装目标和非武装目标反应差异的基础。
The current study examined blood oxygen level dependent (BOLD) signal underlying racial differences in threat detection. During fMRI, participants determined whether pictures of Black or White individuals held weapons. They were instructed to make shoot responses when the picture showed armed individuals but don’t shoot responses to unarmed individuals, with the cost of not shooting armed individuals being greater than that of shooting unarmed individuals. Participants were faster to shoot armed Blacks than Whites, but faster in making don’t shoot responses to unarmed Whites than Blacks. Brain activity differed to armed versus unarmed targets depending on target race, suggesting different mechanisms underlying threat versus safety decisions. Anterior cingulate cortex was preferentially engaged for unarmed Whites than Blacks. Parietal and visual cortical regions exhibited greater activity for armed Blacks than Whites. Seed-based functional connectivity of the amygdala revealed greater coherence with parietal and visual cortices for armed Blacks than Whites. Furthermore, greater implicit Black-danger associations were associated with increased amygdala activation to armed Blacks, compared to armed Whites. Our results suggest that different neural mechanisms may underlie racial differences in responses to armed versus unarmed targets.