Why a survey can't settle whether the videos cause the problem
A cross-sectional study measures short-form video use and attention at essentially the same moment. That design is good at spotting a pattern — for example, that college students who report more short-form video addiction also tend to show poorer sustained attention [2], or that emerging adults who use these platforms more report more inattention [5]. What it cannot do is establish which came first. Someone whose attention is already fragile may spend more time scrolling, and that would produce the same correlation without the videos doing any harm.
An experiment would break that tie by controlling who gets exposed to short-form video and comparing them with a group that does not. The closest thing in this set of studies is work that combined survey data with laboratory behavioral tasks and experimental manipulations inside short-video contexts, finding deficits in self-control among excessive users [4]. That is a stronger design than a plain survey, but it still does not cleanly isolate sustained attention as an outcome caused by short-form video exposure, and the participants' ages are not specified, so it cannot be assumed to describe young adults specifically [4].
The pattern researchers keep finding: heavier use, shakier attention
Across the cross-sectional work, the recurring signal is a negative association: more short-form video use goes with poorer sustained attention. One study of young adults examined daily time spent on short-form video alongside sustained attention and attentional stability [1]. Another focused specifically on addiction to short-form video among college students and linked it to sustained attention and academic performance [2]. A third, surveying emerging adults, framed the outcome as attentional control and inattention, and reported associations that appeared specific to particular platforms rather than uniform across all short-form video use [5].
That last detail matters for interpretation. If the association were a simple dose-response effect of "short videos" in general, you would expect it to show up evenly. Instead, the platform-specific pattern is consistent with the idea that particular design features, not the short format alone, may be doing the work — though this remains a possibility raised by the findings rather than a demonstrated mechanism [5]. The review literature reaches a similar bottom line: short-form video use has been linked to poorer sustained attention in everyday contexts, but the evidence base is mostly cross-sectional [3].
Who these findings actually describe
The scope is narrower than "young adults" in general. The systematic review covered ages 18 to 29 but noted that its samples were largely students and young adults, which limits how far the conclusions stretch to other populations [3]. The college-student study is, by design, about college students [2], and the emerging-adult survey describes that group specifically [5]. The behavioral study of excessive users does not report participant ages, so it cannot be folded into the young-adult picture without assuming something the evidence does not state [4].
So the honest summary is a correlation observed mainly in student and emerging-adult samples, strongest for problematic or excessive use, with platform-specific variation. That is a real and consistent signal, but it is a signal about who is struggling, not proof of what made them struggle.
What would actually move this from correlation to cause
To answer the causal question, you would need experiments that assign short-form video exposure — or a reduction in it — and then measure sustained attention, ideally with follow-up over time. The review's own conclusion points the same way: because the evidence is predominantly cross-sectional, causal claims are not supported yet [3]. The mixed survey-and-laboratory approach used with excessive users is a step in that direction, but it examined self-control deficits rather than establishing that short-form video use degrades sustained attention in young adults [4].
For now, the practical reading is that cross-sectional studies are the weaker of the two designs for this question, and they are most of what exists. They justify concern about heavy use, especially addictive patterns, but not a confident claim that short-form video harms sustained attention in young adults.
Sources used in this answer
Short-Form Video Consumption and Sustained Attentional Stability in Young People
In a cross-sectional study of young adults, daily time spent on short-form video was examined alongside sustained attention and attentional stability.
Addiction to short form video, sustained attention span and academic performance among college students: A cross-sectional study
A cross-sectional study of college students examined the relationship between short-form video addiction, sustained attention, and academic performance.
Short-form video, cognitive and mental health outcomes: a systematic review
A systematic review of young adults aged 18–29 linked short-form video use to poorer sustained attention in everyday contexts but concluded that predominantly cross-sectional evidence does not allow causal conclusions, and student-heavy samples limit generalisability.
Deficits in Self-Control Among Excessive Short-Form Video Users: Behavioral Evidence under Short-Video Contexts
Combining cross-sectional surveys, laboratory behavioral tasks, and experimental manipulations in short-video contexts, the study found self-control deficits among excessive short-form video users, without specifying participant ages.
Short-Form Video Platforms and Attentional Control: Evidence for Domain-and Platform-Specific Associations
A cross-sectional survey of emerging adults found associations between short-form video use and attentional control/inattention that were specific to particular domains and platforms rather than uniform.