neuroscience79.825 min read
Three Gradients Shape Lifespan Cortical Hierarchy
16 days ago•Source: Nature
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20.37 min•18 days ago
Psilocybin’s 5-HT2A activation linked to lasting brain plasticity in mice
A mouse study shows psilocybin dose-dependently activates the brain’s 5-HT2A receptors in the prefrontal cortex, with an inverted-U relationship for acute behaviors. The following day, moderate doses reduced anxiety-like exploration and higher doses decreased depression-like immobility, coinciding with changes in microtubule dynamics and increased synaptic plasticity proteins—primarily in the prefrontal cortex, not the amygdala—suggesting a neural mechanism for lasting antidepressant effects, though results in animals may not directly translate to humans.
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One-dose DMT restores mood and brain circuitry in stressed mice
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Blocking nitric oxide normalizes autism-like traits in mice
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Two Brain Subtypes in ADHD Hint at Personalized Treatments
A study using structural MRI and machine learning identifies two distinct physical subtypes of ADHD. Subtype 1 shows increased gray matter in the frontal regions and cerebellum, linked to severe inattention; Subtype 2 shows widespread gray matter reductions in the cerebellum, frontal regions, and hippocampus, tied to higher overall severity and hyperactive/impulsive symptoms. Through a pseudo-time-series analysis and causal-network mapping, researchers reveal subtype-specific brain–behavior progression patterns, suggesting potential for personalized diagnosis and treatment, though longitudinal studies are needed to confirm progression and acknowledge cross-sectional design limitations.
Parenting circuits double as prosocial engines in mice
New work in mice shows that the medial preoptic area (MPOA) circuits governing parenting also drive prosocial allogrooming toward stressed peers, via overlapping neuronal ensembles and an MPOA–to–VTA pathway that modulates dopamine release in the nucleus accumbens. Activity‑dependent labeling reveals MPOA ensembles active during parenting are required for allogrooming, while MPOA neurons activated during prosocial acts are needed for pup grooming, suggesting shared neural substrates and that offspring‑care circuits may scaffold broader adult prosocial behavior.
Mindful Dynamics: Two Meditation Styles Drive Distinct Brain States in Expert Monks
A magnetoencephalography study of twelve highly trained Buddhist monks comparing Samatha (focused attention) and Vipassana (open monitoring) shows meditation reshapes brain dynamics beyond simple gamma increases: after removing non-rhythmic background noise, rhythmic gamma activity declines during both styles and brain signals become more complex and less tied to recent activity. Vipassana nudges the brain toward a critical state and flexible awareness, while Samatha remains more ordered. Hours of practice may align meditative states with resting patterns; a machine-learning classifier could distinguish meditating from resting states. Limitations include small sample size and no control group.
Dendrites Carry Tailored Teaching Signals for Brain Learning
A Nature study using a neurofeedback brain–computer interface in mice shows distal dendrites of layer-5 cortical neurons carry vectorized, neuron-specific teaching signals that encode reward and task error separate from somatic activity. These somato-dendritic residuals predict learning, and disrupting dendritic signals (via anaesthesia or layer-1 interneuron activation) impairs learning, providing the first biological evidence for a vectorized credit-assignment mechanism in the brain that parallels ideas from artificial learning systems.
Acetate boosts memory in female mice, study finds
A Science Signaling study shows acetate, a by-product of metabolism, enhances long-term memory in female mice by promoting histone acetylation and upregulating learning-related genes in the dorsal hippocampus; the effect is minimal in males and requires concurrent learning activity.
Super agers keep generating young neurons into old age
New Nature study finds that older adults with healthy cognition, including 'super agers', continue to produce immature neurons in the hippocampus at higher levels than those with cognitive decline, suggesting persistent neurogenesis may support memory; the neuron fraction is tiny (~0.01%), and the small sample sizes mean results should be interpreted cautiously; researchers hope to harness this process to develop therapies that boost neurogenesis in aging and Alzheimer's.
Overclocking Neurons: One Training Session Yields Lasting Memories Across Species
Researchers inhibited the mitochondrial calcium exporter LETM1 in fruit flies and mice, causing calcium to linger in mitochondria and boosting ATP production. This metabolic boost allowed a single training session to form long-term memories lasting over 24 hours, while middle-term memory remained unchanged, and the effect was conserved across species, suggesting neuronal energy availability can shape memory consolidation. The approach currently relies on genetic manipulation and isn’t yet transferable to humans, but could point to future strategies to enhance memory or address diseases with energy deficits, pending safer, more precise tools.
Breathing rhythms may choreograph memory retrieval
New findings in The Journal of Neuroscience report that breathing timing can influence memory retrieval. In 18 young adults, EEG and a breath sensor linked brain alpha/beta oscillations and memory reactivation to the respiratory cycle: recalling an image cue was more accurate when the cue appeared during inhalation, with memory processing aligning to exhalation. Stronger breath-brain coupling predicted better memory scores, suggesting respiration acts as a scaffold for episodic retrieval. Authors caution that effects are modest and causality isn’t proven, and results reflect spontaneous breathing rather than deliberate breathing exercises.
Moderate cannabis use linked to preserved brain health in older adults
A UK Biobank study of 26,000+ adults aged 40–77 found lifetime cannabis use generally associates with larger volumes in CB1-rich brain regions (notably the hippocampus) and better cognitive performance, with the strongest benefits in moderate users; however, some regions showed different effects (posterior cingulate volume lower), and researchers caution that potency, usage patterns, and aging context matter, so this is not a clinical recommendation.
Boosting NAD+ Rewires RNA Splicing to Undo Alzheimer's Brain Damage
An international study shows boosting NAD+ levels can protect and reverse Alzheimer's-related brain damage by activating an EVA1C-regulated RNA-splicing pathway, correcting mis-splicing, improving hundreds of genes tied to brain health, and restoring memory in worm and mouse models with supporting human brain data—hinting at a new therapeutic approach beyond targeting plaques or tangles.