Endless Smartphone Scrolling Carries Cognitive and Physical Costs
Heavy smartphone use may be doing more than eating into free time. In a Semmelweis University study published in Acta Psychologica, the pattern of use mattered as much as the amount, with passive scrolling tied to poorer memory, weaker attention, disrupted sleep, and possible balance problems.
The work points to a behavioral profile rather than a simple screen-time threshold. Weak self-control and fear of missing out, or FOMO, lined up more closely with problematic smartphone use than personality alone, suggesting that the urge to keep checking a device can become a self-reinforcing loop of stimulation, anxiety, and reduced inhibitory control.
FOMO and Self-Control Outweighed Personality Alone
Researchers studied young adults between 18 and 35 years of age, asking about daily smartphone habits alongside mental health, physical health, and cognitive performance. Participants completed online questionnaires about how long they used their phones, what they did on them, whether phone use caused them to miss planned activities, and whether their thoughts stayed locked on the device even when it was not in hand.
The analysis also examined self-control, fear of missing out, and neuroticism, the personality trait associated with a stronger tendency to experience anxiety, sadness, fear, and anger. The finding was blunt: neuroticism by itself did not define an “addicted” phone user. A person may be emotionally reactive without becoming trapped in compulsive checking. The stronger signal came from difficulty regulating impulses and an intense need to stay socially plugged in.
Dr. Johanna Takács, lead researcher at the Faculty of Health Sciences at Semmelweis University, framed the result in practical terms: people who are prone to negative emotion do not automatically develop problematic smartphone behavior. What differentiates vulnerable users is the ability to control behavior, emotions, and impulses, along with the degree of pressure they feel to avoid missing something online.
Heavy Process Use Carried the Stricter Cognitive Signal
The study separated participants into three patterns of use. A “pure social” group mainly used phones to communicate and maintain relationships. A “light process” group spent less than four to five hours per day on a mix of social interaction, news, entertainment, and passive browsing. A “heavy process” group, accounting for about one third of participants, spent four to five hours or more daily on phones and mainly consumed online content rather than communicating directly.
One sentence captures the sharpest clinical concern: passive scrolling was linked to worse memory and attention performance than would be expected for age.
That pattern matters because endless feeds and short-video platforms deliver a rapid stream of changing cues, each one asking the brain to reorient. Repeated switching can fragment sustained attention, load working memory, and leave users mentally fatigued before they realize it. The findings also fit a familiar behavioral loop: the more novel the content, the easier it becomes to continue scrolling, and the harder it becomes to stop on purpose.
Participants in the heavy process group also reported poorer sleep, a stronger craving for constant stimulation, and greater difficulty resisting the urge to check their phones or act on impulses. Those features cluster in a way that resembles compulsive reward-seeking behavior, where immediate digital novelty repeatedly outcompetes slower, more effortful forms of concentration.
Screen Time Alone Missed the Posture Problem
The physical side of smartphone use pointed in a different direction. Total usage time was more closely associated with posture-related consequences, especially the forward head position that develops when people hold phones at waist or chest level and look downward for long stretches.
Beáta Seregély, who handled the physical measurements in the study, described how sustained forward head posture can place extra strain on the neck and contribute to so-called text neck. Over time, that position may do more than cause discomfort. The neck contains receptors that inform the brain about the position of the head, and prolonged distortion of that input can interfere with balance and coordination. In everyday life, the result may show up as slower reaction time, less stable posture, or a greater sense of imbalance during movement.
The mechanism is plausible. Cervical proprioception helps the brain integrate head position with visual and vestibular signals, and prolonged forward flexion can alter that sensory feedback. In a young adult who spends hours hunched over a screen, the problem is not limited to soreness in the neck; the pattern may affect how the body organizes movement.
Sleep, Attention, and the Pull of Constant Stimulation
Disrupted sleep ran through the cognitive findings as well. Late-night scrolling keeps the brain exposed to cognitive stimulation at the very time it should be winding down, and blue-light exposure, emotional arousal, and endless content switching can all push sleep later or make it lighter. Poor sleep then feeds back into next-day attention and impulse control, increasing the chance of more checking behavior.
This is where the study becomes especially relevant for clinicians, educators, and families. The question is not simply whether young adults spend hours on their phones. It is whether the phone is being used as a social tool, a passive stimulation device, or a compulsive escape from boredom, stress, or social uncertainty. The cognitive and behavioral profile appears different across those patterns.
Healthier Use May Matter More Than Cutting Time Alone
The investigators do not argue for eliminating smartphones from young people’s lives. Instead, they point toward changing the conditions that make overuse more likely. Reducing unnecessary notifications, limiting time on social platforms, avoiding phone use before bed, and improving physical activity and posture may reduce both psychological and physical strain.
Behavioral support may be especially relevant for users with weak self-control or high FOMO. If the core driver is the compulsion to stay connected, then simply telling people to “use their phone less” misses the mechanism. Skills that strengthen impulse regulation and reduce social pressure to remain constantly available may do more than generic screen limits alone.
The study leaves one important boundary intact: the findings do not prove that scrolling causes the observed cognitive differences. Even so, the association between passive content consumption, impaired attention, poorer sleep, and postural strain is strong enough to shape how clinicians and researchers think about smartphone overuse. A device designed for connection can also train the brain to expect constant interruption, and the body pays for the posture that comes with it.