Radiologists at the Regional University Hospital of Malaga in Spain have launched a research project to examine how smartphone usage patterns alter brain maturation in teenagers between the ages of 14 and 17.
Led by Dr. Maria Vidal, a neuroradiologist at the hospital, the study investigates the relationship between cortical thickness, daily screen time, the specific types of digital content consumed, and the healthy habits displaced by mobile phone use.
The research is funded by the Spanish Society of Medical Radiology (Seram), a national professional organization dedicated to advancing medical imaging standards and clinical diagnostic research across Spain. The new initiative builds directly on previously published scientific studies that identified significant structural changes in the cerebral cortex of preadolescents aged nine to 10.
Earlier neuroimaging studies demonstrated that children aged nine and 10 reach a critical inflection point in neurodevelopment, marking the structural transition from childhood to an adolescent brain architecture. The cerebral cortex is the outermost layer of neural tissue in the human brain, responsible for higher-order cognitive functions including memory, attention, language, perception, decision-making, and emotional processing.
Studying teenage brain maturation
Dr. Vidal explained that she chose to focus on adolescents aged 14 to 17 partly because her clinical practice centers on adult neuroradiology. To avoid recruiting healthy volunteers from the general population, the researchers are enrolling hospital patients who have already been referred by neurologists for a brain magnetic resonance imaging (MRI) scan to investigate conditions such as vertigo or migraines.
Magnetic resonance imaging is a non-invasive diagnostic scanning technique that utilizes powerful magnetic fields and radio waves to generate detailed cross-sectional images of soft tissues and brain structures without exposing patients to ionizing radiation. Teenagers who agree to participate in the study undergo their standard diagnostic scan while completing a comprehensive questionnaire regarding their daily technology habits.
The age window between 14 and 17 represents another critical phase in brain development characterized by rapid dendritic arborization, a biological process where neurons sprout branch-like extensions called dendrites to establish new synaptic connections with surrounding nerve cells. From age 14 through age 25, the human brain undergoes an accelerated phase of structural remodeling as young people begin making independent decisions.
Measuring cortical thickness and social brain changes
Dr. Vidal and her research team hypothesize that adolescents with heavy smartphone habits will display distinct cortical maturation patterns compared to what would occur without smartphone exposure. At the time of the study's announcement, the research team had enrolled 12 patients, with the goal of expanding the cohort to approximately 80 participants over the next two years.
Taking part in the research does not alter the clinical diagnostic process for participating teenagers, as they undergo only the MRI scan originally ordered by their attending neurologist. The Malaga research team anonymizes all survey data, and grant funds from Seram were used to purchase specialized neuroimaging software capable of measuring cortical thickness precisely to calculate statistical associations between brain structure and screen habits.
Drawing on prior evidence observed in younger children, the researchers anticipate discovering an accelerated rate of cortical maturation within the temporal and parietal regions of the brain. Dr. Vidal noted that accelerated maturation in these areas is considered a negative developmental outcome rather than a benefit.
The temporal cortex, situated along the sides of the brain beneath the temples, and the parietal cortex, located in the upper rear portion of the skull, form core components of the brain's social processing network. These regions work together to process empathy, interpret subtle human facial expressions, and guide appropriate behavioral reactions during social interactions.
Impact of short videos and digital interruptions
In the study questionnaires, participants detail the specific screen formats they interact with, including the exact number of hours spent viewing short videos on platforms such as TikTok or watching and listening to podcasts.
Dr. Vidal clarified that owning a smartphone is not inherently harmful in itself. The primary concern stems from total daily usage time, the essential developmental activities displaced by constant screen engagement, and the mental health risks associated with living absorbed in social media platforms during key developmental years.
The research team is specifically tracking how excessive screen time displaces activities critical to healthy cortical maturation, such as obtaining adequate sleep, engaging in regular physical exercise, and spending time reading.
When asked whether potential brain alterations vary according to different video formats, Dr. Vidal explained that continuous disruption of attention has been proven to be particularly damaging to human brain function. Citing a study published in 2026, she noted that every single digital notification or attention interruption causes a cognitive delay of seven seconds.
