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Mark Nicholas

@markolas.bsky.social
302 followers 237 following 12 posts

Postdoc at HHMI Janelia, retired footballer, maker of good food markolas11.github.io

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Reposted by Mark Nicholas
CMU Neuroscience Institute @cmu-neuroscience.bsky.social · 09/03/2026
New research from the Wood Neuro Research Group suggests sickle cell disease changes how the brain’s networks work together, with the brain calling on extra support from attention systems to keep thinking and decision-making on track. www.cmu.edu/ni/news-even...
cmu.edu
New study shows how sickle cell affects brain function
New research from the Wood Neuro Research Group suggests sickle cell disease changes how the brain’s networks work together, with the brain calling on extra support from attention systems to keep thin...
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Reposted by Mark Nicholas
Matt Geramita @mattgeramita.bsky.social · 05/12/2025
Excited to share my postdoc work with @yttrilab.bsky.social and @ahmarilab.bsky.social where we show that the striatal indirect pathway mediates hesitation in mice (www.nature.com/articles/s41...). And I'm honored to have @ahmarilab.bsky.social introduce the findings with a musical abstract!
nature.com
The striatal indirect pathway mediates hesitation - Nature Neuroscience
Hesitation—pausing in the face of uncertainty—is ubiquitous in daily life and disrupted in several psychiatric disorders. Unlike other forms of response inhibition, hesitation is mediated by indirect,...
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Mark Nicholas @markolas.bsky.social · 14/11/2025
Interested in how cortex and striatum contribute to trained vs spontaneous behavior?? If you're at #sfn25, check out @braininspired.bsky.social talk Sunday at 1 #neuroskyence
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Reposted by Mark Nicholas
Yttri Lab @yttrilab.bsky.social · 14/11/2025
I hope this new-ish paper will challenge people to think about the interpretations of our models STRIATUM SUPPORTS REINFORCEMENT AND NOT ACTION SELECTION (!!!) tinyurl.com/HodgeAndYttri @cmuscience.bsky.social @cmu-neuroscience.bsky.social #neuroskyence
tinyurl.com
Striatal modulation supports context-specific reinforcement and not action selection
Hodge et al. used closed-loop optogenetic stimulation and naturalistic behaviors to determine that striatal activity does not select the action to perform but rather biases performance through reinfor...
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Reposted by Mark Nicholas
Antonio Falasconi @antofala.bsky.social · 27/10/2025
Happy to share our primer on Basal Ganglia - Brainstem interactions! From how the basal ganglia communicate with Brainstem motor circuits to how these activity patterns might come about! With Silvia Arber, now out in Current Biology www.cell.com/current-biol...
cell.com
Basal ganglia–brainstem interactions
Our body executes many different movements with precision. Falasconi and Arber describe how basal ganglia interact with brainstem circuits controlling body movements and propose a movement-specific li...
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Mark Nicholas @markolas.bsky.social · 23/09/2025
I started studying neuroscience back in 2012. This week I will be defending my PhD from the @yttrilab.bsky.social at @cmu.edu @the-cnbc.bsky.social Date: Friday, September 26th Time: 2:30 pm eastern If you are interested in the Zoom option, please reach out. #neuroskyence
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Mark Nicholas @markolas.bsky.social · 21/08/2025
Thank you so much to @lauragrima.bsky.social for presenting her recent preprint today at @the-cnbc.bsky.social @cmu-neuroscience.bsky.social Super cool science and design www.biorxiv.org/content/10.1... #neuroskyence
biorxiv.org
A global dopaminergic learning rate enables adaptive foraging across many options
In natural environments, animals must efficiently allocate their choices across multiple concurrently available resources when foraging, a complex decision-making process not fully captured by existin...
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Reposted by Mark Nicholas
Vinny Costa @vincentcostaphd.bsky.social · 27/06/2025
Why do we go downstairs when we hear a scary noise at night? New #preprint by postdoc Kati Rothenhoefer shows how novelty seeking & explore-exploit decision making in #macaques resolves curiosity about whether choices will lead to appetitive or aversive outcomes. www.biorxiv.org/content/10.1...
biorxiv.org
Dissociable effects of curiosity and hedonic valence on reinforcement learning
Curiosity and exploration support learning and adaptive decision-making in uncertain environments. While these processes are sensitive to motivational context, it remains unclear how outcome valence s...
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Reposted by Mark Nicholas
Barbara Shinn-Cunningham @barbsc.bsky.social · 17/06/2025
Neuroscience peeps! There is an amazing opportunity opening up at CMU! www.imsearch.com/open-searche... @cmu-neuroscience.bsky.social @cmuscience.bsky.social @cmu.edu
imsearch.com
Director | Isaacson, Miller
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Reposted by Mark Nicholas
Julie Fabre @juliefabre.bsky.social · 13/06/2025
🚀 We are excited to share that bombcell is now available in Python! 🐍 Automatically sort your units into good/MUA/noise/non-somatic using quality metrics and interpretable & adjustable classification thresholds. pip install and play around with our toy dataset: 🔗 github.com/Julie-Fabre/...
github.com
GitHub - Julie-Fabre/bombcell: Automated quality control, curation and neuron classification of spike-sorted electrophysiology data
Automated quality control, curation and neuron classification of spike-sorted electrophysiology data - Julie-Fabre/bombcell
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Reposted by Mark Nicholas
Antonio Falasconi @antofala.bsky.social · 28/05/2025
Forelimb movement control at the basal ganglia - brainstem interface! Happy to finally share this work from me and @harsh-kanodia.bsky.social with Silvia Arber! @biozentrum.unibas.ch @fmiscience.bsky.social www.nature.com/articles/s41...
nature.com
Dynamic basal ganglia output signals license and suppress forelimb movements - Nature
Basal ganglia output neurons fire dynamically in bidirectional and movement-specific patterns to license forelimb movements. 
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Reposted by Mark Nicholas
CMU Neuroscience Institute @cmu-neuroscience.bsky.social · 27/05/2025
Tim Verstynen, Interim Director of the NI, has been awarded the 2025 Guggenheim Fellowship! 👏 Awarded annually to "trailblazing artists and scholars," Tim will be inducted into the 100th class of Guggenheim Fellows on June 2. Read more about his upcoming "exploration of exploration." 🌎 ⬇️
cmu.edu
CMU Neuroscientist Has Big Plans for Guggenheim Fellowship - Neuroscience Institute - Carnegie Mellon University
Timothy Verstynen has always been fascinated by how organisms explore their environments — from the human quest to map the surfaces of distant planets to the itty-bitty journeys of single-celled bacte...
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Reposted by Mark Nicholas
Tim Verstynen @tdverstynen.bsky.social · 24/03/2025
🚨New lab preprint alert!🚨 Grab a drink, sit down, and let me walk you through the moment-by-moment process of how information loops through basal ganglia circuits during a decision. (Link at the end of the thread) 1/9
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Mark Nicholas @markolas.bsky.social · 20/03/2025
Having learned from Carl both as an undergraduate and graduate student, I continually go back to my notes and the topics studied in his course to help me think about concepts in cognitive neuroscience. Thank you, Carl
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Mark Nicholas @markolas.bsky.social · 12/02/2025
Super proud of this work and as I finish up my #PhD studies I am actively looking for a #postdoc position. I am interested in studying learning and value-based decision making and how cortical and subcortical areas contribute to complex behavior tinyurl.com/LesionsOfM1 #neuroskyence
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Reposted by Mark Nicholas
Victoria Corbit, PhD @victoriacorbit.bsky.social · 30/01/2025
It's a little surreal that this paper is finally out. My last paper from my PhD and likely my last mouse neuro publication ever! Ft. @ahmarilab.bsky.social @piantadosisean.bsky.social If you're into mouse behavior, optogenetics, and calcium imaging, here's this 🐀🔦🔬 www.cell.com/cell-reports...
cell.com
Dissociable roles of central striatum and anterior lateral motor area in initiating and sustaining naturalistic behavior
Corbit et al. studied patterns of activity in corticostriatal circuits during naturally occurring complex behavior in mice. In contrast to models in which cortex leads striatum, these findings suggest...
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Mark Nicholas @markolas.bsky.social · 17/12/2024
Thanks to @antofala.bsky.social and @harsh-kanodia.bsky.social of @biozentrum.bsky.social for presenting at our journal club on some really cool SNr/brainstem activity during skilled reaching #neuroskyence
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Mark Nicholas @markolas.bsky.social · 19/11/2024
hello world
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