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Psilocybin Reduced Fish Aggression Bursts in Rivulus Study

MHD featured image for psilocybin effects on aggression and activity in a mangrove rivulus fish model.

A 2026 study involving 32 adult mangrove rivulus fish pairs found that 3,000 µg/L waterborne psilocybin reduced movement and aggressive swimming bursts, but the result belongs in animal behavioral pharmacology, not in human aggression treatment claims.1 Research Highlights Fish movement decreased: psilocybin produced a treatment-by-time interaction for time spent moving (p = 0.006), with a …

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Major Upper-Extremity Amputation Raised Mental Health Odds

Major upper-extremity amputation was linked to substantially higher odds of new mental-health diagnosis, antidepressant initiation, and psychotherapy claims than minor upper-extremity amputation in a matched national database study. The clearest clinical implication is early mental-health screening after major limb loss, not waiting for distress to surface months later.1 Research Highlights 2,452 matched patients were analyzed: …

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Inflammatory Depression Had Higher Kynurenine Metabolites

A 2026 biomarker study found kynurenine-pathway activation in inflammatory major depressive disorder (MDD), but not across all depression cases. Compared with non-inflammatory MDD and healthy controls, the inflammatory subgroup had higher pathway metabolites, and omega-3 treatment reduced several of them over 8 weeks.1 Research Highlights Inflammatory depression showed kynurenine activation: people with MDD and high-sensitivity …

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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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Alzheimer’s Blood Biomarker Models Lose Rule-Out Power Across Cohorts

Editorial card showing Alzheimer's blood biomarker model transfer across cohorts with PET scan and blood assay imagery.

A 2026 ADNI/A4 validation study found that Alzheimer’s plasma-biomarker machine-learning models still ranked amyloid PET status well across cohorts, but the practical rule-out number moved hard: negative predictive value fell from 0.831 inside ADNI to 0.644 when the ADNI-trained model was applied to A4.1 Research Highlights 1,707-person ADNI/A4 test: researchers trained amyloid PET prediction models …

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Seletracetam for Seizure Rescue: Non-Benzodiazepine Alternative Revisited

MHD featured image for seletracetam as a possible non-benzodiazepine seizure rescue therapy.

A 2026 CNS Drugs review argues that seletracetam, an abandoned second-generation racetam antiseizure drug, may be unusually well suited for seizure rescue: early oral studies involved 171 participants, photosensitivity responses occurred in 32 of 36 exposures, and one intranasal named-patient use reduced reading-induced spike rate from 3.1/min to 1.6/min without sedation. Research Highlights Rescue-therapy rationale: …

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