If you've ever found yourself stuck in a TikTok or Instagram Reels spiral, promising yourself ‘just one more video,’ you're not alone—and there are some psychological reasons behind why it's so hard to stop. A recently published meta-analysis including 70 studies has found that heavy ‘short-form’ video use is consistently linked to poorer mental health and cognitive functioning, especially in young people.

The platforms are designed to keep you scrolling, and algorithms predict exactly what you'll like next, autoplay removes natural stopping points, and each swipe delivers unpredictable content that triggers reward-based engagement patterns in your brain. This unpredictability is key—it works like a slot machine, keeping you hooked because you never know what's coming next.

Researchers found that higher short-form video use was associated with increased depression, anxiety, stress, and loneliness, alongside lower emotional well-being and reduced sleep duration. Crucially, how you use these platforms matters as much as how long. Problematic use—where you can't stop despite wanting to, feel irritable when prevented from using them, or where they interfere with sleep, schoolwork, or relationships—poses the greatest risk.

The review also revealed concerning effects on cognition, particularly for adolescents whose brains are still developing. Heavy users showed poorer attention, impulse control, working memory, language abilities, and reasoning abilities—all functions essential for academic success. The fast-paced, highly stimulating nature of short videos may make it harder for developing brains to focus on slower, more effortful tasks like studying or reading.

In addition, spending a long-time viewing video means that you neglect things which are beneficial for your mental health, such as exercise, face-to-face socialising and time in nature. The researchers suggest that small changes can help: turn off autoplay, set intentional time limits, move apps off your home screen, charge your phone outside your bedroom, and curate your feed by removing content that triggers stress or comparison.

Reference: Nguyen, L., Walters, J., Paul, S., Monreal Ijurco, S., Rainey, G. E., Parekh, N., Blair, G., & Darrah, M. (2025). Feeds, feelings, and focus: A systematic review and meta-analysis examining the cognitive and mental health correlates of short-form video use. Psychological Bulletin, 151(9), 1125–1146. https://doi.org/10.1037/bul000...

ANSWER THE FOLLOWING QUESTIONS!

1. What is a 'meta-analysis'?

2. Use your knowledge of reinforcement to explain why it is difficult to stop watching 'short form' videos as seen on TikTok or Instagram Reels.

3. The research found an association between short-form video use and poorer mental health outcomes. Explain why we cannot conclude that short-form video use causes these negative outcomes.

4. Despite the fact that we cannot conclude that short-form video causes negative outcomes, why might a correlation be more appropriate than an experiment in this study?

5. Identify at least two alternative explanations for the correlation between heavy short-form video use and depression/anxiety symptoms.