What the dopamine story actually claims
The explanation runs like this: short-video feeds deliver rewards on an unpredictable schedule, and unpredictable rewards are especially good at driving repeated behavior. One paper describes platforms combining immediate feedback with variable ratio reinforcement—the same intermittent payoff pattern long used to explain gambling-like persistence [2]. Another frames the problem as habituation to high stimulation and dopamine, producing what it calls "dopamine-scrolling" [1]. A third ties compulsive checking and long screen time to dopamine-mediated reinforcement [3].
Notice what is doing the work in these accounts. The observable part is the behavior: checking, scrolling, staying on the app. The dopamine part is the explanation layered on top. That does not make it wrong—it is a reasonable hypothesis—but the papers describe the behavioral pattern and then name a mechanism, rather than measuring the mechanism and finding the behavior follows from it [2][3].
Where the direct-evidence claim comes from
One paper goes further, stating that dopamine release triggered by algorithmic stimuli provides direct evidence of dopamine reward mechanisms in short-video consumption [4]. It also describes a proposed cascade: repeated stimulation leads to downregulation of dopamine receptors and an elevated reward threshold, which in ordinary terms means the brain adapts and needs more stimulation to feel the same payoff.
That is a specific and testable claim, but the abstract presents it as a statement rather than showing the measurement behind it. The same paper's account of receptor downregulation reads as a general pharmacological principle applied to short videos, not as something observed in short-video users in that study. So even the strongest direct-evidence claim here should be read as a proposal about mechanism, not a demonstrated finding.
Why the inference feels so convincing
The behavioral evidence is genuinely striking, and that is part of the problem. Variable reward schedules, personalized recommendations, and escalating screen time are all documented features of how these platforms operate and how people use them [2][3]. Because dopamine is the well-known currency of reward learning, the leap from "intermittent rewards drive repetition" to "dopamine drives short-video compulsion" feels like a short step.
It is still a step. A 2025 study on usage intensity, addiction, mood enhancement, and attention control describes dopamine surges as a result of continuous imagery and the pursuit of the next video [5]. That is a causal-sounding statement, but the study's focus is on usage intensity and its associations with addiction and attention—not on measuring dopamine. The dopamine surge is asserted as background, not tested as a variable.
What would actually settle the question
To move from inference to direct evidence, a study would need to measure dopamine or its proxies in people while they use short-video feeds, and show that the measurement tracks compulsive use rather than merely accompanying it. None of these papers report that. The closest is the claim of dopamine release from algorithmic stimuli [4], which lacks the methodological detail in its abstract to evaluate.
For now, the honest summary is that the dopamine reward explanation is a well-motivated hypothesis consistent with the behavioral data, not a directly supported conclusion. The behavior is real and well described; the mechanism is inferred. That distinction matters, because interventions built on the assumption that dopamine is the lever may miss whatever else is keeping people scrolling.
Sources used in this answer
Short-Form Video Consumption and Sustained Attentional Stability in Young People
Short-form video consumption is linked to habituation to high stimulation and dopamine, described as "dopamine-scrolling," but the paper does not clarify whether this is direct or inferred evidence.
Attention and Reward Mechanisms in Continuous Short-Video Viewing: Cognitive and Behavioral Effects
Short-video platforms are described as activating the dopamine reward system through personalized recommendations and variable ratio reinforcement, though the evidence's directness is not clarified.
The Effect of Short-Video Addiction on Attention Span and Academic Performance among University Students
Short-video addiction is associated with compulsive checking and longer screen time, with dopamine-mediated reinforcement mentioned but not established as direct evidence.
Psychological Mechanisms and Intervention Strategies for College Students' Short-Video Addiction in Algorithmic Recommendation Scenarios
The paper claims dopamine release triggered by algorithmic stimuli provides direct evidence of dopamine reward mechanisms, and proposes that repeated stimulation downregulates dopamine receptors and raises the reward threshold.
Potential effect of short video usage intensity on short video addiction, perceived mood enhancement ('TikTok brain'), and attention control among Chinese …
Short video usage intensity is examined in relation to addiction, perceived mood enhancement, and attention control, with dopamine surges described as a result of continuous imagery and reward pursuit rather than measured directly.