A new study suggests that short videos, the kind that dominate social media feeds and increasingly show up in classrooms, are far less effective for learning than longer videos. Participants who watched short clips forgot more of what they saw, and their brains showed different activity patterns compared to those who watched longer content.
According to a report published in Communications Psychology, researchers at Yunnan Normal University and Central China Normal University recruited more than 150 college students and showed them videos about remote travel destinations. Some videos ran about 10 minutes. Others ranged from 30 seconds to two and a half minutes. Some participants were told to memorize the content. Others were not.
The study's authors framed the question directly in their paper. "The rapid rise of short videos, particularly social media-style formats characterized by rapid switching and fragmented content, has led to their increasing integration into learning environments," wrote Meiting Wei, Yandan Li and their colleagues. "However, their efficacy and neurocognitive impact remain contentious. The present study examined whether short videos are superior or inferior to long videos as tools for learning and memory."
The results pointed clearly in one direction. "Behaviorally, participants learning with short videos showed significantly lower immediate memory accuracy across encoding conditions and exhibited a higher rate of forgetting when explicitly instructed to remember," the authors wrote.
What made the study unusual was how the researchers observed the participants. Each student watched the videos while inside a functional magnetic resonance imaging scanner, a machine that maps brain activity by tracking changes in blood flow. The fMRI data allowed the team to look not just at test scores, but at how the brain itself responded to each format.
The researchers also used inter-subject correlation analysis, a method that measures how similarly different people's brains respond to the same stimulus. Consistent neural responses across viewers suggest that the content is holding attention and being processed in a meaningful way. Fragmented or inconsistent responses suggest the opposite.
The findings carry practical weight at a time when short video formats are being adopted in educational settings. Many online content creators now produce brief summaries of complex topics, and some teachers have begun incorporating them into lessons. Studies cited in the paper note that users browsing online or scrolling through social media spend under one minute on average watching individual videos, a pattern that shapes both what creators produce and what learners encounter.
The research team published their findings in Communications Psychology. The study involved three separate experiments, each testing memory under different conditions, including cases where participants were specifically told to remember and cases where they were not. In both scenarios, short video viewers performed worse.
