Author Interviews, Cognitive Issues, Karolinski Institute, Pediatrics / 18.12.2025
Karolinska Institutet Finds Children with Higher Social Media Use Showed Gradual Increase in Inattention Symptoms
MedicalResearch.com Interview with:
Samson Nivins PhD
Postdoctoral Researcher, specializing in Perinatal and Pediatric Neurology
[caption id="attachment_71834" align="alignleft" width="92"] Dr. Klingberg[/caption]
Torkel Klingberg, M.D., Ph.D.
Professor of Cognitive Neuroscience at the Stockholm Brain Institute
Karolinska Institutet, Stockholm Sweden
MedicalResearch.com: What is the background for this study?
Response: In the modern era, children’s use of digital media such as watching videos, playing video games, and using social media has increased substantially, often coinciding with a decline in outdoor activities. As many school-aged children now own personal devices, particularly smartphones, it has become easier for them to spend more time on screens than intended. For example, a German survey cited in an EU briefing reported that in 2020, 27% of 8-9-year-olds and 54% of 10-11-year-olds owned a smartphone. In the U.S., ~30% of children own a smartphone by age eight, with many receiving their first device between ages 10 and 11.
With growing concerns about screen time, numerous studies have examined its potential consequences and have reported associations between higher screen use and increased ADHD symptoms. However, most of this research has been cross-sectional and has tended to combine different types of digital media such as television, video games, and social media into a single composite measure. This approach may obscure important differences, as various forms of digital media may have distinct effects on ADHD symptoms. To date, relatively few studies have examined the impact of specific types of digital media use on ADHD in a longitudinal framework, and even fewer have accounted for the heritable nature of ADHD.
To address these gaps, this U.S. longitudinal study followed children from ages 9-10 to 13-14 years. The study collected repeated measures of daily time spent on specific digital activities, including television and videos, video games, and social media platforms such as TikTok, Instagram, and Facebook. ADHD symptoms specifically inattention and hyperactivity/impulsivity were assessed using parent reports, and analyses adjusted for genetic factors and socioeconomic status.
Samson Nivins PhD
Postdoctoral Researcher, specializing in Perinatal and Pediatric Neurology
[caption id="attachment_71834" align="alignleft" width="92"] Dr. Klingberg[/caption]
Torkel Klingberg, M.D., Ph.D.
Professor of Cognitive Neuroscience at the Stockholm Brain Institute
Karolinska Institutet, Stockholm Sweden
MedicalResearch.com: What is the background for this study?
Response: In the modern era, children’s use of digital media such as watching videos, playing video games, and using social media has increased substantially, often coinciding with a decline in outdoor activities. As many school-aged children now own personal devices, particularly smartphones, it has become easier for them to spend more time on screens than intended. For example, a German survey cited in an EU briefing reported that in 2020, 27% of 8-9-year-olds and 54% of 10-11-year-olds owned a smartphone. In the U.S., ~30% of children own a smartphone by age eight, with many receiving their first device between ages 10 and 11.
With growing concerns about screen time, numerous studies have examined its potential consequences and have reported associations between higher screen use and increased ADHD symptoms. However, most of this research has been cross-sectional and has tended to combine different types of digital media such as television, video games, and social media into a single composite measure. This approach may obscure important differences, as various forms of digital media may have distinct effects on ADHD symptoms. To date, relatively few studies have examined the impact of specific types of digital media use on ADHD in a longitudinal framework, and even fewer have accounted for the heritable nature of ADHD.
To address these gaps, this U.S. longitudinal study followed children from ages 9-10 to 13-14 years. The study collected repeated measures of daily time spent on specific digital activities, including television and videos, video games, and social media platforms such as TikTok, Instagram, and Facebook. ADHD symptoms specifically inattention and hyperactivity/impulsivity were assessed using parent reports, and analyses adjusted for genetic factors and socioeconomic status.
Yuxia Wei[/caption]
Yuxia Wei | PhD Student
Unit of Epidemiology
Institute of Environmental Medicine
Karolinska Institutet
Stockholm | Sweden
MedicalResearch.com: What is the background for this study?
Response: Diabetes is traditionally known for having two types (type 1 diabetes and type 2 diabetes). However, it is becoming increasingly clear that diabetes is much more complex than this traditional classification. Several attempts have been made to address this heterogeneity and in 2018, a Swedish ground-breaking study proposed that there are five distinct subtypes of diabetes in adults. They have been replicated in different populations and it has been shown that there are differences between the subtypes in terms of genetics and risks of complications. Another way of elucidating the relevance of these subtypes is to investigate whether the influence of known risk factors for diabetes is different on different subtypes. Our study is one of the first attempts to address this. We used a study design known as Mendelian randomization, to investigate the influence of childhood obesity on these diabetes subtypes that typically occur after age 35. This work was a collaboration between Karolinska institutet in Stockholm, University of Bristol in the UK and Sun Yat-Sen University in China.
Tom Arild Torstensen
Department of Neurobiology, Care Sciences and Society
Division of Physiotherapy,
Karolinska Institutet, Huddinge, Sweden and
Holten Institute, Stockholm, Sweden
MedicalResearch.com: What is the background for this study?
Response: People suffering from pain due to knee osteoarthritis (OA) is a major and increasing problem. There there is today good scientific evidence for different forms of exercise therapy, but there is no agreement regarding what type of exercises and what dose of exercise therapy is best. Thus, we wanted to investigate if high dose medical exercise therapy is superior to low dose.
