VERDICT: TRUE The core scientific claims in the TikTok post accurately describe a real, peer-reviewed study published in Science on June 11, 2026: Marek et al., "Patterns of brain-wide associations reflect socioeconomics," Science 392(6803):eaee6213, DOI 10.1126/science.aee6213 (PMID 42275495). **Two independent primary sources (peer-reviewed journal + university):** 1. PubMed / National Library of Medicine (peer-reviewed journal record): https://pubmed.ncbi.nlm.nih.gov/42275495/ 2. Washington University School of Medicine — The Source (university): https://source.washu.edu/2026/06/socioeconomic-factors-linked-to-lasting-imprint-in-kids-brains/ (Corroborating university source: Mallinckrodt Institute of Radiology, WashU Medicine: https://www.mir.wustl.edu/socioeconomic-factors-have-lasting-effects-on-child-brain-development/) **Claim-linked findings confirmed by the primary sources:** 1. **Socioeconomic factors are visible in children's brain scans, and cognitive ability is NOT.** The PubMed abstract states SES "showed the strongest brain-wide associations," and these "were strongest in motor and sensory but not cognitive regions." The WashU article confirms that "brain regions associated with cognition and problem-solving were less tied to socioeconomic factors," and that after adjusting for SES, "roughly 70% of these associations [between brain measures and IQ] were no longer statistically significant" — in high-SES-only children, "IQ had no correlation with brain structure or function." This directly supports the claim that cognitive ability does not differ by neighborhood income in the scans. 2. **Sleep and stress are the linked mechanisms.** The WashU article states that "the parts of the brain that reflect socioeconomic factors were the same areas most sensitive to sleep and stress," and that "socioeconomic disadvantage affects the brain indirectly through disrupted sleep and chronic stress." The study's senior author is quoted: "It's not a less-smart brain. It appears to be a tired and stressed brain." This supports the claim that sleep and stress differ by neighborhood income. **Caveat (why not "MISLEADING"):** The study analyzed ~11,878 children ages 9–10 from the NIH-funded ABCD Study, and socioeconomic factors accounted for ~16% of variability in brain function. The TikTok's closing line about "organized youth sport, coaching, safe places to play" is the author's own editorial extrapolation — it is not a finding of the study and is not attributed to it. The study itself does not examine youth sport access. However, since the post frames that as the author's reasoning ("Now think about...") rather than as a study finding, and every factual claim about the research is accurate, the verdict is TRUE. The scientific content is faithfully represented; the sport-access commentary is clearly presented as the author's inference, not as part of the Science paper.