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Arif A. Hamid, Ph.D.

@arifahamid.bsky.social
1.3K followers 212 following 22 posts

Professor of Neuroscience @UMN Medical School | Neurobiology of Reinforcement Learning #BlackinSTEM #NeuroscienceinAfrica HamidLab.org

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Reposted by Arif A. Hamid, Ph.D.
RLDM @rldmparis2027.bsky.social · 29/09/2026
📣 Save the date! RLDM 2027, the Multi-disciplinary Conference on Reinforcement Learning and Decision Making, is coming to Paris, July 6-9, 2027 🎉 Stay tuned for submission deadlines and more updates on our website rldm.org 👀
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Reposted by Arif A. Hamid, Ph.D.
Shenhav Lab @shenhavlab.bsky.social · 28/09/2026
Our newest paper, "The three biggest obstacles to solving motivated behavior, and how to overcome them," is now in press at Advances in Motivation Science 🎉 osf.io/preprints/ps... To learn more about the obstacles & solutions the paper poses, see the 🧵 below: bsky.app/profile/did:...
osf.io
OSF
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Reposted by Arif A. Hamid, Ph.D.
bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 24/09/2026
Task-Relevant Cognitive Load Modulates Fast and Slow Processes Underlying Motor Adaptation www.biorxiv.org/content/10.64898/20…
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Reposted by Arif A. Hamid, Ph.D.
Mitchell Ostrow @neurostrow.bsky.social · 21/09/2026
Very excited to announce our most recent paper! TL;DR we made our prior work on comparing dynamics (DSA) much faster and generalizable to diverse data domains and problem settings (1/)
biorxiv.org
A metric for comparing complex systems by their dynamics
Comparisons are fundamental to science: experiment against model, one organism against another, a system against itself across time. Because many systems, from brains to climate, are characterized by ...
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Reposted by Arif A. Hamid, Ph.D.
The Rockefeller University @rockefeller.edu · 22/09/2026
We are thrilled to announce that molecular biologist and neuroscientist Catherine Dulac of @harvardmcb.bsky.social is the 2026 winner of Rockefeller's Pearl Meister Greengard Prize! Register now for the award ceremony on Oct 20. #WomenInScience 🔗: bit.ly/3V2pZMA
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Reposted by Arif A. Hamid, Ph.D.
bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 22/09/2026
The impact of alpha synuclein overexpression on nigrostriatal transmission www.biorxiv.org/content/10.64898/20…
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Reposted by Arif A. Hamid, Ph.D.
Jeremiah Cohen @jeremiahycohen.bsky.social · 16/09/2026
Happy to share the version of record of our locus coeruleus paper here: www.nature.com/articles/s41... Prior thread on some of our discoveries in this study: bsky.app/profile/jere...
nature.com
Topographic structure and function of locus coeruleus noradrenaline neurons - Nature
Dorsal and ventral noradrenergic neurons in the locus coeruleus form topographic subpopulations whose projection patterns and activity encode choice switching, reward-prediction errors and disregard o...
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Reposted by Arif A. Hamid, Ph.D.
Jonathan Tsay @tsay.bsky.social · 14/09/2026
New preprint! 🥳 How do we discover what to do when a movement goes wrong? Answer: hypothesis testing (HT) - testing and evaluating candidate motor solutions based on sensory evidence. HT explains how we explore, and when exploration gives way to an “aha!” moment.
biorxiv.org
Understanding Strategic Motor Learning as a Process of Hypothesis Testing
Multiple learning processes contribute to successful goal-directed actions under changing physiological states, biomechanical constraints, and environmental contexts. Among these, explicit strategies ...
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Reposted by Arif A. Hamid, Ph.D.
Terence Tao @teorth.bsky.social · 11/09/2026
A group of 25 Fields Medalists, including myself, have made a joint declaration on Math and AI: mathandai.org . We welcome additional signatories. See also this article in the Economist announcing the declaration: www.economist.com/science-and-...
mathandai.org
Declaration — Math and AI
Read the declaration and add your name.
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Reposted by Arif A. Hamid, Ph.D.
Ryan Truong @heyodogo.bsky.social · 10/09/2026
We present PlayTrain, a new Reinforcement Learning (RL) framework that reimagines how we build video-game environments for RL by harnessing LLMs’ ability to write JavaScript games. PlayTrain turns single-file JS browser games into RL environments ready for efficient training.
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Reposted by Arif A. Hamid, Ph.D.
Drew Schreiner @schreinerdrew.bsky.social · 09/09/2026
I’m on the faculty job market this fall! 🐦🧠 I’m an NIH K99/R00 awardee studying how the brain learns complex skills, using birdsong to connect molecules, synapses, circuits, behavior & computation. Know of a search where I might fit? Please send it my way & share!
drewschreiner.github.io
Drew Schreiner, Ph.D. | Neuroscience of Learning
I use birdsong to understand how the brain learns complex skills across molecules, synapses, circuits, behavior, and computation. On the 2026–27 faculty job market.
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Reposted by Arif A. Hamid, Ph.D.
Christophe 🔬 Leterrier @christlet.bsky.social · 08/09/2026
So... an academic and an Anthropic employee used LLMs (including OpenAI models) to make decisive progress on the Navier Stokes resolution. Then OpenAI claimed to have done it and will not clearly disclose if it used access to the two researchers' LLM sessions to do so cims.nyu.edu/~tristanb/st...
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Reposted by Arif A. Hamid, Ph.D.
Biological Psychiatry @biologicalpsych.bsky.social · 24/08/2026
Depression disrupts a specific brain region's ability to evaluate control over effort, revealing distinct neural pathways for different types of motivation.
biologicalpsychiatrycnni.org
How value and control shape motivation: Dissociable mesocorticolimbic circuits and vmPFC dysfunction in depression
Motivation arises from the integration of anticipated reward value and perceived control over effort allocation, yet the neural mechanisms through which these computations shape motivated behavior,…
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Reposted by Arif A. Hamid, Ph.D.
Adam Carter @carterlab.bsky.social · 01/09/2026
Happy to share our new J Neurosci paper showing how cortical and thalamic inputs engage cholinergic interneurons in the nucleus accumbens (NAc) core: www.jneurosci.org/content/earl...
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Reposted by Arif A. Hamid, Ph.D.
Spiros Chavlis @spiroschav.bsky.social · 31/08/2026
Last call for #Imbizo TA applications; deadline is tomorrow!
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Reposted by Arif A. Hamid, Ph.D.
Ali Mohebi @mohebial.bsky.social · 29/08/2026
Fluorescence Friday, live from the situation room! Dopamine dynamics (dLight3.8) Top: Fluorescence intensity Bottom: Fluorescence lifetime Methylphenidate does indeed increase the baseline (formerly known as tonic dopamine)
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Reposted by Arif A. Hamid, Ph.D.
Jean-Paul Noel @jpnoel.bsky.social · 29/08/2026
First Noel Lab Pre-print! If you are into "peri-personal space" and feel like we need more single cell recordings, this one is for you! www.biorxiv.org/content/10.6...
biorxiv.org
An egocentric map prioritizing peri-personal space in the mouse rostro-lateral visual area
All physical interactions between an organism and its environment occur within the space immediately adjacent to and surrounding its body, its peripersonal space (PPS). This space has been extensively...
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Reposted by Arif A. Hamid, Ph.D.
bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 28/08/2026
A behaviourally normed database of 1,377 natural sounds for auditory cognition and neuroscience www.biorxiv.org/content/10.64898/20…
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Reposted by Arif A. Hamid, Ph.D.
browncopsy.bsky.social @browncopsy.bsky.social · 11/08/2026
Brown University CoPsy is hiring an Assistant Professor! Research areas: AI & cognition, collective behavior, or brain health. Starting July 2027. Apply by Sept 15: apply.interfolio.com/190677
apply.interfolio.com
Apply - Interfolio {{$ctrl.$state.data.pageTitle}} - Apply - Interfolio
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Reposted by Arif A. Hamid, Ph.D.
eLife @elife.bsky.social · 24/07/2026
Methylphenidate enhances or impairs the cognitive control of Pavlovian bias depending on working memory capacity
buff.ly
Methylphenidate enhances or impairs the cognitive control of Pavlovian bias depending on working memory capacity
Catecholaminergic modulation by methylphenidate affects appetitive and aversive Pavlovian biases of approach and avoidance in humans depending on individual differences in working memory capacity.
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Reposted by Arif A. Hamid, Ph.D.
Juan Linde-Domingo @lindedomingo.bsky.social · 24/07/2026
Replay of procedural memory is independent of the hippocampus 👀👀 www.nature.com/articles/s41...
nature.com
Replay of procedural memory is independent of the hippocampus - Nature Neuroscience
Thompson, Rollik and colleagues show that, during sleep, the brain replays procedural memories in the striatum independently of the hippocampus. Replay content was shaped by prior reward and error out...
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Reposted by Arif A. Hamid, Ph.D.
Neuropsychopharmacology @npp-journal.bsky.social · 23/07/2026
Cue-evoked dopamine signals of termination cues drive automated habit-like behavior
nature.com
Sequence termination cues drive automated habit-like strategy via dopamine-mediated processes
Neuropsychopharmacology - Sequence termination cues drive automated habit-like strategy via dopamine-mediated processes
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Reposted by Arif A. Hamid, Ph.D.
Mitch Roitman @mitchroitman.bsky.social · 22/07/2026
Dopamine and sodium appetite! Sodium appetite causes a 'sign change' in the taste of hypertonic NaCl solutions. We've previously shown that generation of the appetite recruits phasic dopamine to the taste of NaCl; here we show the 'derecruitment' process during satiation.
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Reposted by Arif A. Hamid, Ph.D.
BrainGlobe @brainglobe.info · 16/07/2026
Nice Claude skill to create basic neuroanatomical visualisations with BrainGlobe & blender: github.com/SamedVossber... The single prompt "Use the allen mouse brain atlas to create an animation to show primary visual cortex and primary motor cortex" gives:
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Reposted by Arif A. Hamid, Ph.D.
HHMI @hhmi-science.bsky.social · 21/07/2026
Thinking about applying to become a #FreemanHrabowski Scholar, #HannaGray Fellow, or #GilliamFellow? Our Science Programs team went live to cover key program details, elements of a strong application, & to take your questions. Watch the replay! bit.ly/4gS5DOM 🧪
bit.ly
Becoming an HHMI Scientist (for Potential Program Applicants)
HHMI's June 2026 live virtual event was a chance for early career scientists to learn more and ask questions about HHMI's upcoming competitions — the Freeman Hrabowski Scholars and Hanna H. Gray Fellows Programs (applications open Nov. 3, 2026), and the Gilliam Fellows Program (applications open Sept. 1, 2026) — which provide generous support to scientists from graduate training through the early faculty years. Featuring Vice President and Chief Scientific Officer Leslie Vosshall; Scientific Program Officers Josh Hall, Angela DePace, and Jose Faraldo-Gomez; and Senior Science Program Coordinator Adrielle Munger, the event covered everything from the details of each program to what HHMI looks for in candidates, and key elements of a strong application. Visit hhmi.org/programs to learn more, and stay connected via email (https://www.hhmi.org/newsletters) and social (below) for regular updates. _____ Follow HHMI https://www.instagram.com/hhmi_science/ https://www.linkedin.com/company/howard-hughes-medical-institute https://www.facebook.com/HowardHughesMed https://x.com/hhmi_science Bluesky: https://bsky.app/profile/hhmi-science.bsky.social
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Reposted by Arif A. Hamid, Ph.D.
bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 23/06/2026
Cholinergic interneuron control of GABAergic circuits targeting spiny projection neurons is disrupted in parkinsonian models www.biorxiv.org/content/10.64898/20…
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Reposted by Arif A. Hamid, Ph.D.
Charlie Wilson @crewilson.bsky.social · 23/06/2026
New preprint from the team - what's the role of frontal cortex - LPFC & MCC - in learning about progress towards goals? Data from the checking project collected by Fred Stoll. New analyses by Xiaoqi Xu. With Matteo di Volo, Manu Procyk, & skytorial from @nilskolling.bsky.social below
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Reposted by Arif A. Hamid, Ph.D.
Ben Saunders @bensaunders.bsky.social · 19/06/2026
Check our new work! Studies led brilliantly by @louisakuper.bsky.social. We investigate the parafascicular thalamus as an interface of sensory, attention, and movement signals that guide exploration and cue-related learning.
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Reposted by Arif A. Hamid, Ph.D.
bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 02/06/2026
A genetic tool targeting brain GPR75 www.biorxiv.org/content/10.64898/20…
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Reposted by Arif A. Hamid, Ph.D.
bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 22/05/2026
A Small-Molecule Mitochondrial Complex I Modulator Improves Behavioral and Mitochondrial Dysfunction in Schizophrenia www.biorxiv.org/content/10.64898/20…
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Reposted by Arif A. Hamid, Ph.D.
Theresa Desrochers, Ph.D. @desrocherslab.bsky.social · 19/05/2026
I remember the first time I learned about affordances and what the brain does with them - our learning about how we relate to things in the world. So cool! Check out the latest by @sci_toons explaining them: 🧪 🧠 youtu.be/cs3Clg5Syf8?...
youtu.be
Affordances: How our Bodies and Environment Shape Thought
Imagine you are building a robot to clean your room. The robot needs to overcome a number of challenges in order to complete its tasks, including: perceiving things from changing perspectives,…
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Reposted by Arif A. Hamid, Ph.D.
Earl K. Miller @earlkmiller.bsky.social · 18/05/2026
Our brains don’t think in a steady stream. They rhythmically “scan” different alternatives, using attention cycles to sample and compare choices. Rhythmic sampling of multiple decision alternatives in the human brain www.nature.com/articles/s41... #neuroscience
nature.com
Rhythmic sampling of multiple decision alternatives in the human brain - Nature Communications
How humans process competing information when making multi-alternative decisions remains unclear. Here, the authors show that the brain resolves the trade-off between “evaluating within” and “comparin...
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Reposted by Arif A. Hamid, Ph.D.
Robb Rutledge @robbrutledge.bsky.social · 14/05/2026
🎉New positions!🎉 Postdoc and Research technician openings in our lab @yale for computational psychiatry research. Technician position a great stepping stone to grad school. More info: rutledgelab.org/positions Work w/big data from our smartphone apps and large clinical samples happinessquest.app
rutledgelab.org
Postdoc and Research Technician Positions — Rutledge Lab
Now hiring a postdoc and a research technician with an interest in neuroeconomics or computational psychiatry.
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Arif A. Hamid, Ph.D. @arifahamid.bsky.social · 12/05/2026
Super important!
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Reposted by Arif A. Hamid, Ph.D.
Laura Grima @lauragrima.bsky.social · 09/05/2026
Really pleased that this work with @dudman.bsky.social is now out in Neuron: A global dopaminergic learning rate enables adaptive foraging across many options
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Reposted by Arif A. Hamid, Ph.D.
Stephen Turner @stephenturner.us · 03/05/2026
Free and open-source images, icons, and tools for creating scientific illustrations doi.org/10.59350/5zt... 🧪
doi.org
Free and open-source images, icons, and tools for creating scientific illustrations
Phylopic, NIH Bioart, Bioicons, Scidraw, Open Science Art, Health Icons, Servier Medical Art, Biodiversity Heritage Library, the Noun Project, Segment Anything, Excalidraw, draw.io, Biographics
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Reposted by Arif A. Hamid, Ph.D.
bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 01/05/2026
Reward and punishment differentially shape basketball free-throw learning www.biorxiv.org/content/10.64898/20…
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Reposted by Arif A. Hamid, Ph.D.
Ben Saunders @bensaunders.bsky.social · 21/04/2026
Another PhD! Huge congratulations to Dr. @margestelzner.bsky.social!!!! She completed a fantastic dissertation defense yesterday. We are all really proud!
A woman seated in front of balloons and other celebratory decorations.
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Kendall Powell @kendallsciwrite.bsky.social · 21/04/2026
Are you coming up for tenure review in the next couple of years? See the @nature.com Careers team's advice for assembling a kick-ass tenure portfolio. Reporting by @scattercushion.bsky.social A step-by-step guide to nailing your tenure promotion package www.nature.com/articles/d41...
nature.com
A step-by-step guide to nailing your tenure promotion package
It’s an important milestone in many academic careers, yet the tenure process is surprisingly nebulous. Here’s what it takes to succeed.
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Reposted by Arif A. Hamid, Ph.D.
HHMI @hhmi-science.bsky.social · 20/04/2026
The kind of stable, sustained support that can transform a career: Our #FreemanHrabowski Scholars Program offers early career faculty up to $10M over 10 years, plus salary & benefits. Postdoc? This year's competition has a program for you, too. Applications open 11/3! bit.ly/4tFKifj
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Reposted by Arif A. Hamid, Ph.D.
Sam Gershman @gershbrain.bsky.social · 17/04/2026
To accompany my textbook (Computational Foundations of Cognitive Neuroscience) and the class I taught this semester, I'm open-sourcing my lectures slides: gershmanlab.com/lectures.html I'll continue to update these as I improve them.
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Reposted by Arif A. Hamid, Ph.D.
Leslie B Vosshall PhD @leslievosshall.bsky.social · 16/04/2026
Scientific publishing needs to change. HHMI President Erin O'Shea and Bodo Stern argue that the incentives are misaligned. Researchers should be evaluated on what they choose to share, not what journals select. Proud that HHMI @hhmi-science.bsky.social is leading the way. Pre-Print: bit.ly/4sDCCsu
doi.org
Realigning incentives for biomedical researchers and journals through researcher-shared outputs
In this preprint the authors propose a shift in what counts in the biomedical sciences: researchers should be recognized for what they choose to share on their own terms and timeline (for example as p...
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Reposted by Arif A. Hamid, Ph.D.
Leslie B Vosshall PhD @leslievosshall.bsky.social · 17/04/2026
📢🎉@hhmi-science.bsky.social HHMI competition for the next cohorts of #HannaGray Fellows and #FreemanHrabowski Scholars opening 11/3/2026. Senior postdocs and faculty within 7 years of appointment. Up to $10M over 10 yrs, + salary & benefits. Spread the word and consider applying! bit.ly/4vhC0LA
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Reposted by Arif A. Hamid, Ph.D.
Shervin Safavi @neuroprinciplist.bsky.social · 07/04/2026
If you need a method to infer causality from neural data, even when the signal is short, check our recent paper: Paper: joss.theoj.org/papers/10.21... Code: github.com/CMC-lab/Tran...
joss.theoj.org
TranCIT: Transient Causal Interaction Toolbox
Nouri et al., (2025). TranCIT: Transient Causal Interaction Toolbox. Journal of Open Source Software, 10(116), 9302, https://doi.org/10.21105/joss.09302
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Reposted by Arif A. Hamid, Ph.D.
Rudebeck Lab @rudebecklab.bsky.social · 04/04/2026
Want a dataset to test ideas on neural basis of decision making or how areas interact as we make choices? Check out our data published today @rudebecklab.bsky.social. >16,000 single neurons from 22 anatomically confirmed areas in macaques performing a decision task. www.nature.com/articles/s41...
nature.com
Dataset of cortical and subcortical single neuron activity during value-based tasks in macaque monkey - Scientific Data
Scientific Data - Dataset of cortical and subcortical single neuron activity during value-based tasks in macaque monkey
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The Transmitter @thetransmitter.bsky.social · 31/03/2026
The requested boost would help counter the planned sunsetting of one of the program’s long-standing funding streams, which will result in a $195 million drop in funding for fiscal year 2027. By @avaskham.bsky.social #neuroskyence www.thetransmitter.org/funding/lett...
thetransmitter.org
Letter asks Congress for nearly $500 million to sustain BRAIN Initiative
The boost would help counter the planned sunsetting of one of the program’s long-standing funding streams.
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Reposted by Arif A. Hamid, Ph.D.
HHMI @hhmi-science.bsky.social · 07/12/2025
What happens when HHMI scientists come together? Inspiring conversations, new perspectives, and a shared excitement for discovery. No matter what program they’re part of, our Investigators, Scholars, Fellows, and more join a vibrant scientific community driven by bold ideas.
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Mariam Aly @mariamaly.bsky.social · 24/03/2026
How do the brain’s event representations change as we gain familiarity with an experience? Brain regions’ representations can become coarser or finer as events become familiar. Slow-timescale structure predicts memory. Excited to share this work w/ Narjes Al-Zahli & @chrisbaldassano.bsky.social!
jneurosci.org
Repeated Viewing of a Film Clip Changes Event Timescales in The Brain
Many everyday experiences share a recurring structure: routines, familiar routes, rewatched films, and replayed songs. How do repeated encounters with such structure alter the brain’s representations ...
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Pedro J. Goncalves @ppjgoncalves.bsky.social · 22/03/2026
Proud to see this fantastic work by my PhD student @anastasiakrouglova.bsky.social on multifidelity SBI out in the world!
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Neuropsychopharmacology @npp-journal.bsky.social · 19/03/2026
Using independent component analysis of [18F]Flubatine PET to dissociate β2-containing nicotinic ACh receptor subtypes in the human brain, this study found that subtype-specific nicotinic receptor adaptations may inform smoking cessation therapies
nature.com
Multiple sources of β2*-nicotinic acetylcholine receptor binding are differentially affected during tobacco smoking abstinence as revealed by Independent Component Analysis of [18F]Flubatine PET images
Neuropsychopharmacology - Multiple sources of β2*-nicotinic acetylcholine receptor binding are differentially affected during tobacco smoking abstinence as revealed by Independent Component...
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