Recent research published in NeuroImage has shed light on how compulsive use of short video platforms, such as TikTok, might affect the brain. The study found that individuals with higher levels of short video addiction displayed increased brain activity in regions linked to emotional regulation and reward processing. Moreover, these users showed structural differences in areas such as the orbitofrontal cortex and cerebellum.
The rapid rise in popularity of platforms like TikTok and Instagram Reels has sparked concerns about their impact on mental health and behavior. Often humorously referred to as “brain rot,” excessive use of these platforms is seen as potentially harmful to cognitive sharpness and emotional well-being.
Short video addiction is characterized by the compulsive and uncontrolled consumption of brief, personalized video content. This behavioral pattern has been linked to negative physical, psychological, and social outcomes, including disrupted sleep patterns, emotional dysregulation, and impairments in attention and memory. The fast-paced, highly stimulating nature of short videos may contribute to a reduced attention span and hinder the brain’s ability to focus on more demanding or meaningful tasks, intensifying concerns about their long-term effects on users’ cognitive and emotional health
While the behavioral consequences of short video addiction are increasingly recognized, the underlying neural and biological mechanisms remain poorly understood. To address this gap, researchers from Tianjin Normal University in China conducted a pioneering study. Their goal was to investigate how short video addiction might reshape the brain and to identify specific genes that could influence susceptibility to this behavioral pattern.
Additionally, personality traits such as dispositional envy, which drives negative emotions in response to social comparisons, have been linked to excessive social media use. The researchers were interested in whether envy might serve as a psychological risk factor for addiction to short video platforms, given their emphasis on curated, aspirational content.
The study involved 111 college students aged 17 to 30, all of whom were regular users of short video platforms like TikTok. Participants were carefully screened to exclude those with a history of neurological or psychiatric disorders, ensuring that the findings would be attributable to the behavioral effects of short video consumption rather than pre-existing conditions.
To measure short video addiction, researchers adapted a widely used scale by replacing references to smartphones with short video platforms. Dispositional envy was measured using a standard tool that captures individuals’ tendencies to feel resentment or distress when comparing themselves to others.
To explore the neurological aspects of short video addiction, the researchers collected high-resolution brain imaging data using MRI scans. These scans provided insights into two key areas: structural changes in the brain, such as differences in gray matter volume, and functional activity, specifically regional homogeneity, which measures the synchronization of neural activity within a given area. Statistical techniques were then used to analyze how these brain characteristics correlated with participants’ levels of short video addiction.
Finally, to investigate the biological basis of these findings, the team conducted a transcriptomic analysis, integrating gene expression data from the Allen Human Brain Atlas. This allowed them to identify specific genes associated with the brain changes observed in participants with higher levels of short video addiction.
The researchers observed structural and functional differences in the brains of individuals with higher levels of short video addiction. Structurally, these individuals exhibited increased gray matter volume in the orbitofrontal cortex and cerebellum. a region involved in reward processing, decision-making, and emotional regulation. The increased volume in this area suggests heightened sensitivity to the rewards provided by personalized short video content, potentially reinforcing compulsive viewing behavior. Similarly, changes in the cerebellum, traditionally associated with motor control but increasingly recognized for its role in cognitive and emotional processing, were linked to the sensory-rich, dynamic nature of short videos.
Functionally, the researchers observed heightened neural activity in several regions, including the dorsolateral prefrontal cortex, posterior cingulate cortex, temporal pole, and cerebellum. These areas are involved in decision-making, self-referential thinking, and emotional regulation. The increased activity in these regions suggests that short video addiction might affect both the brain’s reward system and its ability to regulate attention and emotions. For instance, heightened activity in the dorsolateral prefrontal cortex may reflect impaired cognitive control, while the posterior cingulate cortex’s involvement points to overactive self-referential processes, such as constant comparison with others seen in short videos.
The study also highlighted the role of dispositional envy as a psychological factor linked to short video addiction. Participants with higher levels of envy were more likely to report compulsive use of short video platforms. This connection was mediated by changes in specific brain regions, such as the cerebellum and temporal pole, which are involved in processing social and emotional information. These findings suggest that individuals prone to envy may turn to short video platforms to cope with feelings of inadequacy.
On a genetic level, the researchers identified over 500 genes associated with the brain changes linked to short video addiction. These genes were primarily involved in synaptic signaling and neural connectivity, processes essential for brain communication and plasticity. Notably, many of these genes were expressed during adolescence, a critical period for brain development. This finding highlights adolescence as a particularly vulnerable time for developing behavioral patterns like short video addiction.
While the study provides important insights, there are some limitations to consider. For example, the study’s cross-sectional design means that it cannot establish causation—it’s unclear whether brain changes lead to addiction or are a consequence of it. Future longitudinal research could clarify these relationships.
The study, “Neuroanatomical and functional substrates of the short video addiction and its association with brain transcriptomic and cellular architecture,” was authored by Yuanyuan Gao, Ying Hu, Jinlian Wang, Chang Liu, Hohjin Im, Weipeng Jin, Wenwei Zhu, Wei Ge, Guang Zhao, Qiong Yao, Pinchun Wang, Manman Zhang, Xin Niu, Qinghua He, and Qiang Wang.