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Stress Social Deficits Reversed by Amygdala-Oxytocin Circuit Suppression

MHD featured image for stress-induced social changes, mPFC, amygdala, and oxytocin circuits.

A 2026 mouse circuit study found that restraint stress progressively reduced medial prefrontal social coding: mPFC excitatory-neuron transient rates fell to roughly 70-80% of baseline after acute stress and nearly 50% after chronic stress, while suppressing either basolateral-amygdala input or hypothalamic oxytocin input restored social discrimination and behavior.1 The result is a circuit-specific oxytocin finding, …

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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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