网络游戏成瘾者相关脑区功能定位的fMRI研究

目的 采取线索--反应模式,利用功能磁共振成像(fMRI)技术探索与网络游戏成瘾相关的脑区功能定位.方法 网络游戏成瘾者和对照者各20例,在观看相关网络游戏视频录像和日常生活视频录像的同时进行fMRI扫描,进行问卷调查了解受试者观看视频录像后的心理状态并采集脑血氧水平依赖(BOLD)信号得到网络游戏和日常生活视频录像刺激的脑区激活数据,利用相减原则进行相关性分析产生相应的激活区,进行激活脑区的定位并比较激活强度.结果 成瘾者观看网络游戏和日常生活视频录像时所产生的情绪状态、渴望程度、喜欢程度和希望再次观看程度差异均有统计学意义(P<0.05),而对照者仅希望再次观看程度差异有统计学意义(P<0.05);与生活视频比较,对照者观看游戏视频时顶叶(左)和颞叶视皮层(左)的激活强度较高,差异有统计学意义(P<0.05),而成瘾者除伏核(左)和尾状核(左)外,余脑区观看观看游戏视频和生活视频时激活强度差异均有统计学意义(P<0.05).结论 利用fMRI技术可以对网络游戏成瘾者相关脑区进行功能定位,这些脑区可能参与了网络游戏成瘾的产生与维持.

Location of related brain activation in internet game addicts: an fMRI study

Objective To explore the functional location of brain regions related to internet game addiction using clue-reaction model and functional magnetic resonance imaging (fMRI). Methods Twenty participants with internet game addiction and 20 control subjects without addiction were tested. They were presented with different internet game videos and the paired common life videos while undergoing fMRI. Questionnaire survey was employed to investigate their emotion changes after watching the game video; the activation data produced by the stimulations were collected through the measurement of blood-oxygen-level dependent signals in the brain. Subtraction algorithm was adopted to analyze the corresponding regions of interest. The activated brain areas stimulated by the internet game videos were determined. Results Compared with the common life video watching, the interact game video watching showed significantly different results of psychological assessments, including emotional states, degree of thirst, degree of liking and wishing to re-watch in the addiction group (P<0.05); while the interact game video watching only had a strong degree of re-watching as compared with the common life video watching in the control group. As compared with the common life videos, internet game videos could induce significantly high activation in the parietal lobe and visual cortex of the temporal lobe of the left brain region in the control group (P<0.05);while significantly activation of all the brain regions, except the nucleus accumbens and the caudate nucleus of the left brain region, was found in the internet game video watching as compared with those in the common life video watching in the addiction group (P<0.05). Conclusion The regions of brain activation of the internet game addiction can be determined by fMRI and these areas may be involved in the generation and maintenance of the internet game addiction.