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Psilocybin First Use Changed Brain Signals for 1 Month

MHD featured image for first-time psilocybin use, brain entropy, MRI changes, and psychological insight.

A 2026 mechanistic study involving 28 healthy adults found that a single 25 mg psilocybin session changed acute brain entropy, psychological insight, well-being, cognitive flexibility, and some MRI-derived white-matter signals for up to 1 month. Research Highlights Acute brain entropy rose clearly: 25 mg psilocybin increased Lempel-Ziv complexity (LZc; a measure of signal irregularity) at …

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AI Therapy Chatbot and ChatGPT Both Reduced PHQ-9 Depression Scores

MHD featured image for AI therapy chatbot versus ChatGPT depression trial.

A 147-person feasibility randomized trial found that both a structured AI therapy chatbot and general ChatGPT reduced PHQ-9 depression scores compared with assessment-only control, with effect sizes of d = −0.47 and d = −0.44.1 The purpose-built therapy bot did not significantly outperform ChatGPT on depression, anxiety, impairment, or wellbeing. Research Highlights Both chatbots reduced …

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Caregiver Burden Hit 65.3% in Older-Adult Disability Care in Nepal

MHD featured image for caregiver burden in older-adult disability care.

A 430-caregiver study in Kathmandu found caregiving burden in 65.3% of family caregivers of older adults with disability, with adjusted predictors clustering around low economic status, 8 or more daily care hours, and severe impairment in activities of daily living.1 Research Highlights Burden was the majority experience: 65.3% of 430 family caregivers reported caregiving burden …

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Dementia Caregiver Intervention Needed 24 Cultural Adaptations

A 2026 descriptive study documented 24 major cultural adaptations to the New York University Caregiver Intervention-Enhanced Support (NYUCI-ES) for Chinese and Korean American dementia caregivers. The work is not an outcomes report yet; it is a careful map of how an evidence-based caregiver intervention had to change before it could plausibly fit East Asian immigrant …

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Positive Emoji Use Tracked Lower Depression in 120 Students

Low-burden digital phenotyping is appealing because college students already leave daily traces in phones, messages, sleep logs, and voice samples. In Henry et al.’s 120-student study, positive emoji use was the clearest signal compared with GPS and complex voice biomarkers: higher positive emoji use tracked lower depression and anxiety, while speech rate and sleep added …

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Household Pesticide 3-PBA Linked to Depression Risk in 6,502 Adults

MHD featured image for household pesticide biomarkers and depression risk.

A 2026 NHANES analysis of 6,502 adults found that urinary 3-PBA, a pyrethroid insecticide metabolite, was modestly associated with depression risk at OR = 1.02 per 1 μg/L, while self-reported household pesticide exposure weakened after full adjustment to OR = 1.43 (95% CI 0.91 to 2.25).1 The calibrated read is biomarker signal first, causal language …

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Child and Adult Adversity Doubled Frailty in UK Biobank

Editorial card showing a life-course timeline with biological aging biomarkers, illustrating how cumulative childhood and adult adversity stack on the frailty index.

A 2026 UK Biobank analysis by Aas et al. in BMC Medicine tests the “adversity leaves a fixed biological scar” framing against five biological aging markers in 153,557 middle-aged and older adults — and the marker that moves most reliably isn’t telomere length or any metabolomic clock.1 Research Highlights 153,557-participant test: Aas et al. measured …

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