网络成瘾者风险决策能力的脑机制研究

当前,网络成瘾问题已越来越成为社会高度关注的问题之一。研究表明,网络成瘾者与物质成瘾、病理性赌博者一样,在决策行为上表现出与其他成瘾者相似的情况。通过对33名男性网络成瘾大学生和15男性非网络成瘾大学生进行测试,发现网络成瘾大学生选择的风险项比例显著多于非成瘾大学生,且心理安全线更低。通过弥散张量成像技术对两组被试进行扫描后发现,网络成瘾组被试在右侧前辐射冠处的白质MD值显著高于对照组,意味着网络成瘾组被试在该脑区的白质纤维束数量显著低于对照组被试,且纤维束更长。说明网络成瘾者决策能力受损,其脑部生理机制所形成的决策障碍改变了他们的行为。

Brain Mechanism of Internet Addit Decision Making Ability under Risky Conditions

Internet addiction disorder(IAD) is becoming one of the social concerns.Similar to those of material abuse and pathological gambling addicts,Internet addicts have behavioral problems in making decisions.A test was carried out to 33 internet addicted male college students and 15 non-Internet addicted male college students in which the former chose significantly more proportion of risky items and had lower psychological safety value than the latter.After a scan of both sample groups with diffusion tensor imaging technology,it is found that the white matter MD values of the anterior corona radiate of the Internet addict group are prominently higher than the control group,which means the white matter fiber bundles in the brain region of the Internet addict group are remarkably lower in number and longer than those ofthe control group.In conclusion,the decision-making skills of Internet addicts are impaired and the decision-making obstacles caused bythe physiological mechanismoftheir brains alter their behaviors.