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经颅直流电刺激对网络成瘾大学生工作记忆能力的影响
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Abstract:
相关研究发现，网络成瘾综合征会对人们造成行为与认知层面不同程度的负面影响，其中包括人的工作记忆能力。此外，当我们沉迷于某些事物时，工作记忆会变得异常脆弱，导致我们的思维和学习能力受到影响。经颅直流电刺激(tDCS)是一种非侵入性的神经调节技术，它通过不同极性的刺激来影响特定脑区的可塑性，从而提高人类的认知和记忆能力。本研究采用N-back任务作为工作记忆的测量工具，以左侧背外侧前额叶(left dorsolateral prefrontal cortex, lDLPFC)为刺激靶点，将大学生分为真刺激组和伪刺激组，比较tDCS干预前后两组在不同记忆负荷(0-back, 1-back, 2-back)下的正确率和反应时，探讨经颅直流电刺激对网络成瘾者工作记忆能力的影响。结果表明，tDCS真刺激能够显著提高网络成瘾大学生的工作记忆能力(体现在正确率提高和反应时降低)，而伪刺激组则没有显著变化。研究认为左侧背外侧前额叶皮层(lDLPFC)是工作记忆能力的关键脑区，可以作为tDCS干预的靶点。
Relevant studies have found that Internet addiction syndrome can cause different degrees of negative effects on people’s behavior and cognition, including people’s working memory ability. In addition, when we are addicted to something, the working memory can become extremely fragile, causing our thinking and learning ability to be affected. Transcranial direct current stimulation (tDCS) is a non-invasive neuromodulation technique that enhances human cognition and memory by affecting plasticity in specific brain regions through stimulation of different polarity. In this study, using the N-back paradigm and the left dorsolateral prefrontal cortex (lDLPFC) as the stimulus target, and the college students were divided into true stimulus group and pseudo-stimulus group. To explore the effect of transcranial direct current stimulation on the working memory ability of Internet addicts by comparing the accuracy and response of the two groups under different memory loads (0-back, 1-back, 2-back) before and after tDCS intervention. The results show that tDCS true stimulation can significantly improve the working memory ability of Internet addicted college students (reflected in the improvement of correct rate and the reduction of response), while the pseudo-stimulation group has no significant change. It is suggested that the left dorsolateral prefrontal cortex (lDLPFC) is a key brain region in working memory ability and can be used as a target for tDCS intervention.
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