Medical

Seed Testing May Predict Levodopa Response in Parkinson’s

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Seed Testing May Predict Levodopa Response in Parkinson's

TL;DR: A 2026 medRxiv preprint found that alpha-synuclein seed-positive Parkinson’s patients had slower ON-medication motor progression, measured while usual Parkinson’s medication was active, and more sustained levodopa responsiveness than matched seed-negative patients. Key Findings 223 matched patients: The analysis compared 40 SAA-negative and 183 SAA-positive sporadic Parkinson’s patients from PPMI. ON-state progression diverged while medication …

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Schizophrenia May Reflect Advanced Biological Aging

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Schizophrenia May Reflect Advanced Biological Aging

TL;DR: A 2026 systematic review in The British Journal of Psychiatry linked schizophrenia to a multisystem advanced-aging phenotype, including older-appearing brain scans, shorter telomeres, inflammation, and higher dementia risk. Key Findings 170 studies included: The review synthesized studies of aging markers in schizophrenia and non-affective psychosis published after 2009. Most studies were moderate or high …

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Postpartum Depression Meta-Analysis Linked Brain Activity to Neurotransmitter Maps

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Postpartum Depression Meta-Analysis Linked Brain Activity to Neurotransmitter Maps

TL;DR: A 2026 meta-analysis in Psychological Medicine found postpartum depression (PPD) brain-activity differences across default-mode, limbic, and sensorimotor regions, with spatial overlap in serotonin, dopamine, and vesicular acetylcholine transporter maps. Key Findings 12 imaging studies pooled: The meta-analysis included 475 postpartum depression patients and 504 healthy controls. Higher activity appeared in two regions: PPD was …

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Plasma p-tau217 AI Models Lost Utility Across Cohorts

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Plasma p-tau217 AI Models Lost Utility Across Cohorts

TL;DR: A 2026 medRxiv preprint found that plasma p-tau217 AI models still separated amyloid-positive from amyloid-negative people across ADNI and A4, but calibration drift made the same probabilities less dependable for clinical decisions. Key Findings Calibration drift weakened clinical utility: The study trained plasma biomarker machine-learning models in one Alzheimer’s cohort and tested them in …

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Brain-Behavior Associations Reversed Between Group and Individual Levels in 4,000-Person Cognitive Control Study

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Brain-Behavior Associations Reversed Between Group and Individual Levels in 4,000-Person Cognitive Control Study

TL;DR: Across 4,000+ people, the relationship between brain activity and cognitive control flipped direction depending on whether researchers compared people to each other or tracked the same person over time. The finding is called nonergodicity — and it means decades of group-level brain studies may have been telling us the opposite of what’s true inside …

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Mental Health Brain Biomarker Studies Were Mostly Small and Cross-Sectional

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Mental Health Brain Biomarker Studies Were Mostly Small and Cross-Sectional

TL;DR: A 2026 review in BMC Psychiatry found 441 primary MRI and electroencephalogram (EEG), a scalp recording of brain electrical activity, mental-health biomarker studies, but most were small, cross-sectional, and concentrated in depression, making routine clinical use premature. Key Findings 58,824 records screened: Researchers searched MEDLINE and Embase from 2010 to September 2023, then mapped …

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MRI Traced a Possible Brain Drainage Route Without Contrast Dye

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MRI Traced a Possible Brain Drainage Route Without Contrast Dye

TL;DR: A 2022 study in Nature Communications used non-contrast 3D T2-FLAIR MRI, a scan that suppresses ordinary cerebrospinal-fluid brightness, to map possible brain-border drainage routes toward cervical lymph nodes, but FLAIR brightness alone does not prove lymph flow. Key Findings 81 clinical MRI scans supplied the human map: The retrospective cohort included 45 females and …

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Substance Use Disorder Shared Reward-Circuit fMRI Abnormalities

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Substance Use Disorder Shared Reward-Circuit fMRI Abnormalities

TL;DR: A 2025 systematic review in Translational Psychiatry found that substance use disorder was associated with recurring resting-state functional MRI (rs-fMRI), a scan of spontaneous brain-network communication, abnormalities in reward and self-control circuits across 53 studies. Key Findings 53-study meta-analysis: Researchers pooled whole-brain rs-fMRI studies covering 1,700 people with substance use disorder and 1,792 healthy …

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Severe Infections Stayed Linked to Dementia After Comorbidities

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Severe Infections Stayed Linked to Dementia After Comorbidities

TL;DR: A 2026 study in PLOS Medicine found that severe infections stayed linked to later dementia in Finland even after researchers accounted for a broad set of noninfectious comorbid diseases. Key Findings 62,555 dementia cases: The analysis matched Finnish adults diagnosed with late-onset dementia from 2017 to 2020 against 312,772 dementia-free controls. 29 prior hospital …

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Schizophrenia Insight Linked to fMRI Flexibility and Receptor Maps

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Schizophrenia Insight Linked to fMRI Flexibility and Receptor Maps

TL;DR: A 2026 medRxiv preprint on schizophrenia reported that illness insight tracked with resting-state functional MRI (fMRI) flexibility, a measure of how dynamically brain regions reconfigure their connectivity, and that these brain-dynamics patterns aligned with dopamine D2 and serotonin 5-HT2A receptor maps after accounting for antipsychotic receptor occupancy. Key Findings Two insight subtypes: Clinical clustering …

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