Petr Znamenskiy
@petrznam.bsky.social
470 followers 140 following 17 posts
Neuroscientist at the Crick studying cortical microcircuits and cell types. www.znamlab.org
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petrznam.bsky.social
Applications for Doctoral Clinical Fellowships at the Crick, including a project in my lab, are now open! Please share widely!
crick.ac.uk
We're looking for clinicians who are passionate about research to join our 3-year fully funded clinical PhD programme. 🔬🩺

Apply by 14 November 2025. 👇

www.crick.ac.uk/careers-stud...
Doctoral clinical fellows
The Crick's clinical PhD programme.
www.crick.ac.uk
petrznam.bsky.social
We use high refresh rate "gaming" monitors to present closed-loop visual stimuli with low latency. They have various "gaming modes" and response time options that are poorly documented. So @antblot.bsky.social tested every possible setting to find out what they do.

znamlab.org/hardware-con...
Which gaming mode will please my mice?
We use VR setups, see for instance this study, which require fast monitors. We recently got some cheap gaming monitors from MSI
znamlab.org
petrznam.bsky.social
How does the brain blend what we see with what we hear? In collaboration with @flor-iacaruso.bsky.social lab, we find new anatomical and functional rules that govern how auditory and visual cortices talk to each other.

Led by @alexegeaweiss.bsky.social & @bturner-bridger.bsky.social.
flor-iacaruso.bsky.social
1/N What are the organizational principles underlying crossmodal cortical connections?
We address this in this new preprint, led by @alexegeaweiss.bsky.social & ‪@bturner-bridger.bsky.social‬ in collab w/ ‪@petrznam.bsky.social‬ @crick.ac.uk
www.biorxiv.org/content/10.1...
petrznam.bsky.social
One way - it detects inputs of the starter neurons.
petrznam.bsky.social
\5 Long-range inputs onto single V1 neurons reveal the topography of feedback projections from higher visual areas, which mirrors the retinotopic organisation of the visual cortex.
petrznam.bsky.social
4/ We apply BRISC in the mouse primary visual cortex, mapping 7,814 putative synaptic connections of 385 starter neurons and identifying layer- and cell-type-specific connectivity rules.
Reconstructed connectivity matrices of excitatory and inhibitory neurons.
petrznam.bsky.social
3/ Barcodes are read out from intact tissue sections using in situ sequencing, thus reconstructing presynaptic ensembles of individual starter neurons while preserving spatial information.
An animation showing presynaptic subnetworks of several example neurons.
petrznam.bsky.social
2/ BRISC uses random molecular barcodes transsynaptically transmitted by rabies viruses to map inputs of many neurons simultaneously, while maintaining single cell resolution. Connections between individual neurons are then identified by matching their barcode sequences.
Schematic explaining the workflow of BRISC. Starter neurons are defined by AAV injection and infected by barcoded rabies viruses. The barcodes are then transmitted to their presynaptic inputs. Connections are identified by matching barcodes between presynaptic and starter cells using in situ sequencing.
Reposted by Petr Znamenskiy
jamesbriscoe.bsky.social
Agree. Cuts in UKRI funded PhD places, is about government funding and prioritisation. We need work force planning with joined up thinking

A PhD is not about an academic career, its an apprenticeship for the knowledge economy. "Europe's Silicon Valley" will not exist without PhDs
martinhumphries.bsky.social
This is (a) obvious and (b) has been discussed for decades. Don't blame UKRI. What is really needed is workforce planning at a national level. What should the HE/FE sector look like for research and training, and therefore how many PhD places do we need?
chrisjparr.bsky.social
UKRI planned for dramatic drop in #PhD places.

UKRI anticipated that raising the PhD stipend in the face of the cost of living crisis could have dropped the number of new postgraduate research students it funds by up to 50 per cent. #PhDchat

www.researchprofessionalnews.com/rr-news-uk-r...
Reposted by Petr Znamenskiy
markdhumphries.bsky.social
Save the date!

UK Neural Computation 2025 will be at Imperial College London
9 July: ECR day
10-11 July: main meeting

9 invited speakers, 4 talks from abstracts and many posters

Abstract & registration opening soon

Pls share!

neuralcomputation.uk
UKNC25 |
neuralcomputation.uk
Reposted by Petr Znamenskiy
dinanthos.bsky.social
Interested in understanding how things work? In particular the tools you use to study the brain? Join us at TENSS 2025 where we brainstorm ideas, build and debug microscopes, electrophysiology and behavior rigs amidst the picturesque Transylvanian hills! tenss.ro
Apply by: February 16th!
petrznam.bsky.social
📢 If you are at #SfN2023, check out the lab's posters from Yiran He (Sun AM) and Alex Becalick (Mon PM)! I'll be around as well, so send me a message if you'd like to meet and catch up! #SfN23
Reposted by Petr Znamenskiy
bizleylab.bsky.social
We're hiring - a lab tech and fully funded (UK rate) PhD student! Join us at to figure out how the brain constructs auditory space! Adverts here (tech : shorturl.at/hmrFY) and here (PhD studentship : shorturl.at/adoJN). #neuroscience #hearing
petrznam.bsky.social
🚀 Don't miss your chance join @thecrick.bsky.social PhD programme, including projects in my lab! Interested in how neuronal activity, connectivity and gene expression all relate to each other in vivo?

Learn more and apply at crick.ac.uk/careers-stud...

🗓️ Deadline Nov 9! Please repost!
Image of barcoded neurons distributed across a section of the neocortex.
petrznam.bsky.social
Mouse cortical neurons have ~5,000 spines, but how many different presynaptic cells do they get input from? What is the average number of synaptic contacts between connected neurons in the mouse neocortex? I was hoping that there is a good estimate based on EM but I cannot find one.
petrznam.bsky.social
Wow! End of an era indeed! Once a few years ago I tried to crossreference the timing of your and BGB's tweets but there was no clear signal.
Reposted by Petr Znamenskiy
neuroshea.bsky.social
ICYMI for neuro Twitter expats, a long standing mystery is solved.
Reposted by Petr Znamenskiy
jamesbriscoe.bsky.social
Delighted to see this in print from my @TheCrick colleagues in Jonny Kohl's lab

How pregnancy (in mice) changes the behaviour of a population of hypothalamic neurons & initiates parental behaviour before birth

www.science.org/doi/10.1126/...
Hormone-mediated neural remodeling orchestrates parenting onset during pregnancy
Work in mice suggests that hormonal remodeling of distinct hypothalamic neurons during pregnancy promotes parental behavior.
www.science.org
petrznam.bsky.social
(3) We are also looking for a Doctoral Clinical Fellow to join us to map synaptic connections in human brain tissue using high throughput molecular methods, in partnership with Dimitri Kullmann at UCL:
www.crick.ac.uk/careers-stud...
petrznam.bsky.social
Multiple opportunities for PhD projects in my lab at the Francis Crick Institute starting in 2024! The Crick is an incredible place to do science! Please repost!

(1) Mapping neocortical circuits using high throughput molecular connectomics and in vivo imaging:
www.crick.ac.uk/careers-stud...
Znamenskiy Lab | Mapping the neocortical circuit diagram with high-throughput molecular connectomics
www.crick.ac.uk