Mark Histed
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markhisted.org
Mark Histed
@markhisted.org
How brain neural nets do computations; we aim to understand differences in brain wiring, using lasers and neuro-AI.
Lab head, NIH. Prev: media policy for democracypolicy.network.

linktr.ee/markhisted
Pers. views
neuro posts: 🧠 /🧪
Not going to fight about it but I largely agree with your view and the constraints for the short term, but we can incrementally get to a better goal over years
January 13, 2026 at 9:44 PM
Thanks for this. We in the science community were talking about something quite similar about Jim Watson at his recent death. Without excusing either of them, this does somewhat explain how they got to these bad places.
January 13, 2026 at 5:09 PM
Peregrine is good!
January 13, 2026 at 1:14 PM
Hudak is a Ruthenian/Rusyn name, from subcarpathian Rus, now western Ukraine/southern Poland/eastern Slovakia.
January 13, 2026 at 1:10 PM
This. We are going to need major political reform.
Thermostatic elections forever means right wingers destroy every federal agency faster than liberals can build them.

We need major political reform beyond what the median Democratic elected official supports.
New Gallup figures in these charts. Well, so much for that emerging Republican majority people were writing about in November 2024. Was evidently a mass overreaction to Trump's win and failure to acknowledge softness of support, and thermostatic politics www.gelliottmorris.com/p/trumps-win...
January 13, 2026 at 5:30 AM
Macro and AI!
January 13, 2026 at 2:06 AM
also credit to @deisseroth.bsky.social and group for working out the FLEX Cre-dependent scheme, and to Janelia and HHMI for the GCaMP8 progress. Science truly benefits from collaborative effort, across institutions and distance.
January 12, 2026 at 11:48 PM
This wouldn't have been possible without the intramural environment and support also from the BRAIN Initiative. We had a tech problem and we were able to focus on the hurdle, figure out how to build on colleagues' expertise, put some resources in, and solve it.
January 12, 2026 at 11:45 PM
for the big dorks, it's this plasmid:

www.addgene.org/174007/

We find that ChRimson, while not as strong as other opsins, is very stable in the cortex.
Addgene: pAAV-hSyn-DIO-jGCaMP8s-P2A-ChrimsonR-ST
Plasmid pAAV-hSyn-DIO-jGCaMP8s-P2A-ChrimsonR-ST from Dr. Mark Histed's lab contains the insert jGCaMP8s-P2A-ChrimsonR-ST and is published in eNeuro. 2023 Mar 29;10(3):ENEURO.0378-22.2023. doi: 10.1523...
www.addgene.org
January 12, 2026 at 11:44 PM
January 12, 2026 at 11:41 PM
Plain language: we are recording and stimulating neurons in working brains (#mechinterp !), using two high-powered lasers, one to measure activity and one to change it. Getting both proteins inside cells is hard. And this is a solution.

Here's a paper using it:
www.pnas.org/doi/10....

🧠 🤖🧪
January 12, 2026 at 11:40 PM
This is the way for US science and universities too. Heads down doesn’t work. Stand up for what you believe in.
January 12, 2026 at 10:36 PM
also, sharp observation. I agree

"These two literatures have largely talked past each other. Legal scholars often assume presidents lack meaningful authority over the civil service. Public admin scholars document presidential influence but frequently treat it as informal, political, or extralegal."
January 12, 2026 at 3:52 PM
This section is excellent, worth reading as we think about the future of the civil service and gov't capacity.

I think the piece is overall great. But the law is in some sense what the Supreme Court says it is, and we have to focus on the Court as we move forward.
January 12, 2026 at 3:51 PM
And the link to US science is clear: basic science is a public good that gov't is needed to support, and to make that work we need a well-functioning gov't. Which is contrary to the Roberts Court agenda. Scientists need to care about the Supreme Court.

/end
January 12, 2026 at 3:48 PM
Agree with Prof Bednar that Congress should work to improve the law. But if the Supreme Court has this much power (US SCOTUS much more than other countries' constitutional courts), and it wants to harm the civil service, it can find a way.

Court reform is now part of good government.
January 12, 2026 at 3:48 PM
Look at the district court decision by Judge Illston in the RIF case, which declares the RIFs widely illegal. Justice Jackson agreed.
Compare to the SCOTUS majority in that case — which allowed shredding agencies via RIF.

KBJ, p1 here:
www.supremecourt.gov/opinions/24p...
www.supremecourt.gov
January 12, 2026 at 3:48 PM
Norms may be part of what protected the civil service. But a functioning Supreme Court that cared about good govt also protected the civil service.

And this SCOTUS doesn't seem to care about the civil service, so it can interpret away legal requirements ("good administration") if it wants.
January 12, 2026 at 3:48 PM