滑手機對腦部的影響

青少年常見的類似上癮的社群媒體使用 (addiction-like social media use, ASMU) 現象，與憂鬱和其他健康問題密切相關。本研究旨在探討大腦處理正向社交回饋的發展軌跡 (developmental trajectories of neural social feedback) 是否與後期青少年較高的ASMU水平有關。研究中，103名學生在6至9年級期間參加了1至3次功能性磁振造影 (fMRI) 掃描，期間完成了一個社交激勵延遲任務 (social incentive delay task)；大約兩年後 (10至11年級) 他們又進行了關於ASMU和憂鬱症狀的自我報告評估。

研究重點在於考察：

ASMU對大腦對正面社交回饋反應 (positive social feedback) 的影響：特別是在青春期過程中觀察大腦反應的變化。

大腦反應的發展變化與ASMU和憂鬱症狀之間的關係：同時分析了性別之間可能存在的差異。

主要發現是，在青春期期間，下列腦區的反應性逐漸降低：

腹內側前額葉皮質(ventral media prefrontal cortex)

中前額葉皮質(medial prefrontal cortex)

後扣帶皮層(posterior cingulate cortex)

右下額回(right inferior frontal gyrus)

這種反應性下降與兩年後較高的ASMU症狀有關。進一步的分析表明，對於女青少年來說，這種大腦反應性下降不僅會增加ASMU症狀，還會與憂鬱症狀的增加有關；而男青少年則未見明顯聯繫。

研究總結為：在青春期前，大腦對正向社交回饋可能會表現出過度敏感，但隨著青春期的發展，這種反應逐漸減弱，這個過程可能會增加晚期青少年出現類似上癮的社群媒體使用問題的風險。

Translated, summarized and simplified by Microsoft Copilot

Abstract

Addiction-like social media use (ASMU) is widely reported among adolescents and is associated with depression and other negative health outcomes. We aimed to identify developmental trajectories of neural social feedback processing that are linked to higher levels of ASMU in later adolescence. Within a longitudinal design, 103 adolescents completed a social incentive delay task during 1–3 fMRI scans (6–9th grade), and a 4th self-report assessment of ASMU and depressive symptoms ∼2 years later (10–11th grade). We assessed ASMU effects on brain responsivity to positive social feedback across puberty and relationships between brain responsivity development, ASMU symptoms, and depressive symptoms while considering gender effects. Findings demonstrate decreasing responsivity, across puberty, in the ventral media prefrontal cortex, medial prefrontal cortex, posterior cingulate cortex, and right inferior frontal gyrus associated with higher ASMU symptoms over 2 years later. Significant moderated mediation models suggest that these pubertal decreases in brain responsivity are associated with increased ASMU symptoms which, among adolescent girls (but not boys), is in turn associated with increased depressive symptoms. Results suggest initial hyperresponsivity to positive social feedback, before puberty onset, and decreases in this response across development, may be risk factors for ASMU in later adolescence.

Flannery, J. (2024, February 9). Developmental changes in brain function linked with addiction-like social media use two years later | Social Cognitive and affective neuroscience | oxford academic. https://academic.oup.com/scan/article/19/1/nsae008/7604373

深度學習利用人工神經網路來處理資訊，模仿人類腦部的結構與功能。人工智能每分每秒都在成長進化，然而人類無時無刻都在滑手機，瀏覽社交媒體、觀看短片，浪費自身的腦部潛能。今天，在地下鐵車廂內，一位女生正在閱讀一本麥田出版的台版書。雖然我看不到書名，但她已經成為少眾。也許你會說在手機看網絡小說有什麼分別，有機會的話，我會跟您探討它們的分野，對腦部來說，有何分別。