TikTok videos deactivate key brain control regions, study finds
Zhejiang University research shows short-form content suppresses cognitive control networks.
1Core research finding
fMRI study on 56 young adults at Zhejiang University revealed that watching liked TikTok/Reels videos significantly reduces activity in the dorsal anterior cingulate cortex (dACC) and dorsolateral prefrontal cortex (dlPFC). These regions form the core neural networks responsible for self-control and long-term goal maintenance.
2Experimental setup
Participants watched content from a pool of 160 short videos while inside an MRI scanner. Videos were categorized into five types: single-person actions, group interactions, pets, gaming scenes, and nature landscapes. Average video length was 23.7 seconds. Participants could skip unwanted content.
3Neurochemical factors
Proton magnetic resonance spectroscopy (¹H-MRS) measurements showed individuals with higher dACC glutamate levels exhibited less deactivation in cognitive control regions. This suggests neurochemical differences may explain individual variations in responses to digital content consumption.
4Clinical connections
Cognitive control network dysfunctions are linked to depression, anxiety, ADHD, and addiction. The study indicates short-form platforms may exacerbate symptoms in predisposed individuals. Previous research had already established connections between internet addiction and impaired self-control.
5Algorithmic influence
Researchers note that platforms' algorithmically optimized content streams designed for continuous consumption may erode users' cognitive control mechanisms. Earlier studies confirmed even personalized recommendations suppress dACC activity.
6Methodological details
Of 66 initial volunteers, 10 were excluded due to excessive head motion or poor spectroscopy data quality. The remaining 56 participants (37 male, 19 female) averaged 23.3 years old. All had prior experience with short-video apps.
7Behavioral data
Participants watched an average of 19 liked and 36 disliked videos per session. Videos were classified as 'liked' (fully watched), 'disliked' (skipped before midpoint), or 'partially viewed'. Statistical analyses used Bonferroni correction.
8Neuroscientific mechanism
The dACC handles conflict monitoring, reward-based decisions and effort evaluation, while the dlPFC executes top-down control. Normally active during challenging tasks like Stroop or Go/No-Go tests, these regions show opposite responses to entertainment-oriented short videos.
9Industry implications
Findings raise ethical questions about social media UX design. Long-term cognitive effects on young users may necessitate new regulations for content moderation and recommendation algorithms.
10Future research
The team plans similar studies across age groups and clinical populations. Future work will focus on cumulative effects of prolonged use and potential rehabilitation strategies. Findings provide empirical contributions to digital wellbeing discussions.
Original article: Hacker News — TikTok videoları beynin kontrol mekanizmalarını devre dışı bırakıyor