Liu Lu, Yip Sarah W, Zhang Jin-Tao, Wang Ling-Jiao, Shen Zi-Jiao, Liu Ben, Ma Shan-Shan, Yao Yuan-Wei, Fang Xiao-Yi
Institute of Developmental Psychology, Beijing Normal University, Beijing, 100875, China.
Department of Psychiatry, Yale University School of Medicine, New Haven, CT, 06519, USA.
Addict Biol. 2017 May;22(3):791-801. doi: 10.1111/adb.12338. Epub 2016 Jan 5.
Studies conducted in drug addiction suggest a transition in processing of drug-related cues from the ventral to the dorsal component of the striatum. However, this process has not been studied in a behavioral addiction. Assessment of this process in a non-drug addiction can provide insight into the pathophysiology of both substance and behavioral addictions. Thirty-nine male Internet gaming disorder (IGD) subjects and 23 male matched healthy controls (HCs) participated in functional magnetic resonance imaging during performance of a cue-reactivity task involving alternating presentation of Internet gaming-related stimuli (game cues) and general Internet surfing-related stimuli (control cues). Cue-induced neural activations in the ventral and dorsal striatum (DS) were compared between IGD and HC participants. Associations between cue-reactivity within these regions and cue-induced craving and severity and duration of IGD were also explored. IGD participants exhibited higher cue-induced activations within both the ventral and DS when compared with HCs. Within the IGD group, activity within the left ventral striatum (VS) was correlated negatively with cue-induced craving; positive associations were found between activations within the DS (right putamen, pallidum and left caudate) and duration of IGD. Cue-induced activity within the left putamen was negatively associated with right VS volumes among IGD participants. Consistent with studies in substance addictions, our results suggest that a transition from ventral to dorsal striatal processing may occur among individuals with IGD, a condition without the impact of substance intake.
在药物成瘾方面进行的研究表明,与药物相关线索的处理过程会从纹状体的腹侧部分过渡到背侧部分。然而,这一过程尚未在行为成瘾中得到研究。在非药物成瘾中评估这一过程可以深入了解物质成瘾和行为成瘾的病理生理学。39名患有网络成瘾障碍(IGD)的男性受试者和23名匹配的男性健康对照者(HCs)在执行一项线索反应任务期间参与了功能磁共振成像,该任务包括交替呈现与网络游戏相关的刺激(游戏线索)和与一般网络冲浪相关的刺激(对照线索)。比较了IGD参与者和HC参与者在腹侧和背侧纹状体(DS)中线索诱导的神经激活情况。还探讨了这些区域内的线索反应性与线索诱导的渴望以及IGD的严重程度和持续时间之间的关联。与HCs相比,IGD参与者在腹侧和DS中均表现出更高的线索诱导激活。在IGD组中,左侧腹侧纹状体(VS)内的活动与线索诱导的渴望呈负相关;在DS(右侧壳核、苍白球和左侧尾状核)内的激活与IGD的持续时间呈正相关。在IGD参与者中,左侧壳核内的线索诱导活动与右侧VS体积呈负相关。与物质成瘾方面的研究一致,我们的结果表明,在没有物质摄入影响的IGD个体中,可能会发生从腹侧纹状体处理到背侧纹状体处理的转变。