The contrast is striking because cortical thinning is generally associated with normal aging and, when accelerated in specific areas, with neurodegenerative disease. The cerebral cortex is the brain’s folded outer layer, containing networks involved in memory, language, attention, decision-making and sensory processing. In Alzheimer’s disease, damage often emerges in a characteristic sequence that includes the entorhinal cortex, which serves as an important gateway for memory networks, followed by temporal and other cortical regions. In the new study, researchers focused on a composite measure encompassing the entorhinal, fusiform, inferior temporal and middle temporal cortices—areas known to be especially susceptible to Alzheimer’s-related changes.

The study combined data from two independent research groups that differed substantially in both age and sex. One group included 387 men from the Vietnam Era Twin Study of Aging, with an average age of about 62 years. The other consisted of 1,097 women participating in the Women’s Health Initiative Memory Study, whose average age was approximately 78. Using participants’ residential histories, the researchers estimated exposure to outdoor PM2.5 and NO2 during the three years preceding each person’s MRI scan. PM2.5 refers to airborne particles no larger than 2.5 micrometers in diameter—roughly one-thirtieth the width of a human hair. Because of their small size, these particles can penetrate deep into the lungs and may trigger systemic biological effects. Nitrogen dioxide is a reactive gas produced largely by fuel combustion, particularly from traffic and other urban sources.

Among the older women, higher exposure to both pollutants was associated with a thinner cortex across the Alzheimer’s-vulnerable regions. The researchers calculated that each additional microgram per cubic meter of PM2.5 exposure corresponded to an estimated cortical-thickness difference comparable to approximately 13 months of aging. For NO2, each additional part per billion was associated with a difference comparable to roughly three months of aging. These comparisons do not mean that pollution literally adds a fixed number of months to a person’s biological age, nor do they establish that exposure caused the tissue changes. Instead, they provide a way to express the size of the statistical association relative to typical age-related differences in cortical thickness.

The pollution signal was not limited to the four Alzheimer’s-related regions. In the older women, higher PM2.5 exposure was associated with a thinner cortex in 23 of the 34 brain regions examined, spanning the frontal, parietal, temporal and occipital lobes. Such a widespread pattern suggests that the effects of air pollution, if confirmed, may involve broad brain systems rather than a single memory circuit. Potential pathways include inflammation, oxidative stress, impaired blood-vessel function and disruption of the blood-brain barrier, a selective cellular interface that helps regulate which substances enter nervous tissue. Fine particles may also influence the brain indirectly through the lungs and bloodstream, although the present study did not measure the biological mechanisms responsible for the observed associations.

The younger men displayed a very different pattern. In this group, greater exposure to PM2.5 and NO2 was associated with a thicker cortex in the Alzheimer’s-vulnerable regions. While a thicker cortex is often interpreted as a sign of healthier brain tissue, that assumption is not always reliable. Some research suggests that cortical thickening can occur during early phases of certain disease processes, potentially reflecting inflammation, fluid-related swelling, enlargement of glial or neural cells, or other compensatory responses. Early pathological changes related to amyloid accumulation may also alter brain structure before later neurodegeneration produces measurable thinning. However, the study did not measure amyloid, tau, inflammation or other biomarkers, so none of these explanations can be confirmed.

An age-related analysis offered a possible clue to the divergent findings. Among the men, the positive association between PM2.5 exposure and cortical thickness gradually weakened between approximately ages 55 and 64 and became negative after around age 65. The later negative association was not statistically significant, meaning the evidence was insufficient to rule out the possibility that it resulted from chance. Even so, the trajectory raises the possibility that the brain’s structural response to pollution may change over the course of aging. A temporary thickening phase could represent an early biological reaction, followed by thinning as damage accumulates. This interpretation remains a hypothesis rather than a demonstrated sequence, because the participants were assessed at a single point in time rather than repeatedly over many years.

The researchers emphasize that the study cannot determine whether age, sex or other differences between the two groups explain the contrasting results. The participants came from separate cohorts with different demographic, health and life-history characteristics, and the analysis was observational. Residential pollution estimates also represent modeled exposure rather than direct personal measurements and may not capture time spent indoors, occupational exposure, indoor pollution, individual activity patterns or differences in pollutant composition. In addition, brain structure can be influenced by education, cardiovascular health, genetics, socioeconomic conditions, smoking, physical activity and many other factors. Statistical associations in MRI data therefore cannot be interpreted as proof that air pollution directly caused cortical injury or that the participants will develop Alzheimer’s disease.

Even with these limitations, the findings add to a growing body of research linking environmental exposures with brain aging and dementia-related biology. Air pollution is widespread, persistent and potentially modifiable through changes in transportation, energy production, urban planning and public-health policy. The study’s senior investigators argue that advanced neuroimaging can help identify possible effects of pollution years before dementia symptoms become visible. The next stage of research will require longitudinal studies that follow men and women from the same cohorts over time, repeatedly measure pollution exposure and brain structure, and include biomarkers for amyloid, tau, inflammation and vascular injury. Researchers will also need to track cognitive performance to determine whether pollution-related cortical changes predict memory decline or elevated Alzheimer’s risk. Until those studies are completed, the central message is one of caution: air pollution may leave a measurable imprint on the aging brain, but that imprint may not be uniform—and a thicker cortex at one stage of life may not necessarily signal better brain health.

Subject of Research: People

News Publication Date: 14-Jul-2026

Web References: https://ini.usc.edu/ ; https://keck.usc.edu/faculty-search/lauren-salminen/ ; https://doi.org/10.1016/j.neuro.2026.103495

References: NeuroToxicology, DOI: 10.1016/j.neuro.2026.103495

Image Credits: Stevens INI

Keywords: Air pollution, PM2.5, nitrogen dioxide, NO2, Alzheimer’s disease, cortical thickness, brain aging, neuroscience, environmental health, neurodegeneration

The amygdala, a key brain structure historically linked to fear and threat processing, is also central to decoding facial cues—information critical for social interaction. This study leveraged functional MRI scans of thousands of children aged 8 to 11, who were presented with images of faces expressing a range of emotions alongside neutral places. By measuring blood flow indicative of neural activation, researchers isolated how the amygdala reacts to socially rich stimuli.

Intriguingly, high amygdala activation in response to emotional faces predicted divergent social trajectories for boys and girls. Girls with elevated amygdala responses tended to become more socially engaged with peers over the subsequent two years, while boys showed an inverse trend, becoming less socially involved. This differential pattern points to the amygdala’s developmental trajectory playing gender-specific roles during adolescence, a period known for rapid and heterogeneous brain maturation.

The study further established the amygdala as the solitary brain region wherein activity reliably forecasted future social health, underscoring its pivotal role within the “social brain” network. This network comprises neural circuits specialized in recognizing individuals, interpreting emotions, and understanding others’ mental states—all fundamental to navigating complex social environments.

This work builds on prior research identifying adolescent social health profiles—clusters reflecting friend quantity, group composition, and peer conflict levels. Amygdala responses to emotional faces effectively predicted adolescents’ placement within these profiles, providing novel biomarkers for social development trajectories.

These findings illuminate how neural sensitivity to social cues during critical developmental windows can shape interpersonal dynamics. They also highlight sex-specific neural mechanisms that may inform tailored interventions to support social well-being. Given adolescence is a phase of extensive amygdala remodeling, variability in its reactivity underscores individual differences in social outcomes.

Conducted by lead author Myles N. Arrington and colleagues under Professor Amanda E. Guyer at UC Davis’s TEEN Lab, this research offers a new lens for understanding adolescent social health through neurobiological markers. As the landscape of adolescent mental health becomes increasingly complex, such insights pave the way for neuroscience-informed approaches to foster peer connection and emotional resilience.

Supported by the National Institutes of Health, these findings represent a significant stride in decoding the neural bases of adolescence’s social transformations.

Subject of Research: People
Article Title: Contextualizing the adolescent social brain: Links to social health using data from the Adolescent Brain Cognitive Development Study
News Publication Date: 27-Jun-2026
Web References:
https://www.ucdavis.edu/news/roots-fear-understanding-amygdala
https://abcdstudy.org/
https://www.sciencedirect.com/science/article/pii/S1878929326001167?via%3Dihub
Keywords: adolescent brain, amygdala, social health, fMRI, emotional faces, adolescence, peer relationships, social neuroscience