Faculty of Psychology, Tianjin Normal University, Tianjin 300387, PR China.
Independent Researcher, USA.
Neuroimage. 2024 Oct 15;300:120856. doi: 10.1016/j.neuroimage.2024.120856. Epub 2024 Sep 18.
The interplay between personality traits and impulsivity has long been a central theme in psychology and psychiatry. However, the potential association between Greed Personality Traits (GPT) and impulsivity, encompassing both trait and state impulsivity and future time perspective, remains largely unexplored. To address these issues, we employed questionnaires and an inter-temporal choice task to estimate corresponding trait/state impulsivity and collected multi-modal neuroimaging data (resting-state functional imaging: n = 430; diffusion-weighted imaging: n = 426; task-related functional imaging: n = 53) to investigate the underlying microstructural and functional substrates. Behavioral analyses revealed that GPT mediated the association between time perspective (e.g., present fatalism) and trait impulsivity (e.g., motor impulsivity). Functional imaging analyses further identified that brain activation strengths and patterns related to delay length, particularly in the dorsomedial prefrontal cortex, superior parietal lobule, and cerebellum, were associated with GPT. Moreover, individuals with similar levels of greed exhibited analogous spontaneous brain activity patterns, predominantly in the Default Mode Network (DMN), Fronto-Parietal Network (FPN), and Visual Network (VIS). Diffusion imaging analysis observed specific microstructural characteristics in the spinocerebellar/pontocerebellar fasciculus, internal/external capsule, and corona radiata that support the formation of GPT. Furthermore, the corresponding neural activation pattern, spontaneous neural activity pattern, and analogous functional couplings among the aforementioned brain regions mediated the relationships between time perspective and GPT and between GPT and motor impulsivity. These findings provide novel insights into the possible pathway such as time perspective → dispositional greed → impulsivity and uncover their underlying microstructural and functional substrates.
人格特质与冲动性之间的相互作用一直是心理学和精神病学的核心主题。然而，贪婪人格特质（GPT）与冲动性之间的潜在关联，包括特质和状态冲动性以及未来时间视角，在很大程度上仍未得到探索。为了解决这些问题，我们采用问卷和跨期选择任务来估计相应的特质/状态冲动性，并收集多模态神经影像学数据（静息态功能成像：n=430；弥散加权成像：n=426；任务相关功能成像：n=53）来研究潜在的微观结构和功能基础。行为分析表明，GPT 介导了时间视角（例如，现在宿命论）与特质冲动性（例如，运动冲动性）之间的关联。功能成像分析进一步表明，与延迟长度相关的大脑激活强度和模式，特别是在背内侧前额叶皮层、顶叶上回和小脑，与 GPT 有关。此外，具有相似贪婪水平的个体表现出类似的自发脑活动模式，主要在默认模式网络（DMN）、额顶叶网络（FPN）和视觉网络（VIS）中。弥散成像分析观察到在脊髓小脑束/桥脑小脑束、内/外囊和放射冠中存在特定的微观结构特征，支持 GPT 的形成。此外，相应的神经激活模式、自发神经活动模式以及上述大脑区域之间的类似功能耦合，介导了时间视角与 GPT 之间的关系，以及 GPT 与运动冲动性之间的关系。这些发现为可能的途径提供了新的见解，例如时间视角→性格贪婪→冲动性，并揭示了它们潜在的微观结构和功能基础。
