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Guillaume Viejo

@guillaumeviejo

Associate Research scientist at Flatiron. Core developer of @pynapple.bsky.social

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22.01.2025
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Latest posts by Guillaume Viejo @guillaumeviejo

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πŸš€ New workshop before FENS in Barcelona!
Join the Flatiron Institute Center for Computational Neuroscience of the Simons Foundation for a hands-on workshop on pynapple & NeMoS.
Learn to analyze and model neural data with open-source tools.
Accommodation & meals included.
Details ⬇️

03.03.2026 16:39 πŸ‘ 12 πŸ” 6 πŸ’¬ 1 πŸ“Œ 2
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Mission: record hippocampal place cells in zero gravity
Crew: 3 rats with electrode arrays
Vehicle: Space Shuttle Columbia
Status: data now publicly available on DANDI, 28 years later

The ratstronauts' mission is finally complete. πŸ€πŸš€ h/t NASA

about.dandiarchive.org/blog/2026/02...

27.02.2026 14:54 πŸ‘ 60 πŸ” 23 πŸ’¬ 2 πŸ“Œ 8
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Months-long stability of the head-direction system - Nature Longitudinal tracking of individual head-direction cells in the post-subiculum of freely moving mice reveals a cell population structure that shifts subtly with exposure to different environments but otherwise remains highly stable.

Nature research paper: Months-long stability of the head-direction system

go.nature.com/46njM0D

13.02.2026 11:46 πŸ‘ 12 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

This started with @sskromne.bsky.social and me building the UCLA miniscope in the lab.

11.02.2026 19:29 πŸ‘ 6 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Another successful workshop at Flatiron teaching @pynapple.bsky.social and Nemos for neural data analysis. Next workshop should happen before FENS in Barcelona. More information coming soon.

11.02.2026 19:22 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

2 days left to register for the Pre-COSYNE Brainhack 2026 in Lisbon!
A great opportunity to meet the community working on research software, while collaborating on reproducible analyses in systems neuroscience.

16.01.2026 16:41 πŸ‘ 5 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

Don’t miss this! A great opportunity to learn about some really cool neuroinformatics tools for ephys, behavior & imaging ( including Pynapple 🍍)

09.01.2026 16:56 πŸ‘ 8 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

πŸ“£ Pre-COSYNE Brainhack 2026 – Join Us in Lisbon! 🧠✨
March 10–11, 2026 β€’ Lisbon, Portugal

pre-cosyne-brainhack.github.io/hackathon2026

Kick off COSYNE week with two days of hands-on, team-based hacking around real electrophysiology data!

βœ… Apply now via the event website (limited spots).

09.01.2026 11:09 πŸ‘ 9 πŸ” 6 πŸ’¬ 0 πŸ“Œ 1

Pynapple v0.10 is out with major changes. Unified tuning curve function now returns an xarray object, plus new flexible template-matching decoding. Join us at the Flatiron workshop this February to learn Pynapple and other tools for neural data analysis from @flatironinstitute.org.

30.10.2025 16:04 πŸ‘ 2 πŸ” 3 πŸ’¬ 1 πŸ“Œ 1

Great to see @wulfdewolf.bsky.social take his very successful internship at @flatironinstitute.org back to Edinburgh! 🏴󠁧󠁒󠁳󠁣󠁴󠁿 🍍

21.10.2025 19:42 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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A 🍍 spotted in the wild at @edinburgh-uni.bsky.social!

Great crash course on neuro data processing with @pynapple.bsky.social and @spikeinterface.bsky.social delivered by @matthiashennig6.bsky.social, @wulfdewolf.bsky.social and Chris Halcrow. So nice to see both libraries working so well together

21.10.2025 16:24 πŸ‘ 14 πŸ” 4 πŸ’¬ 2 πŸ“Œ 0
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The postsubiculum as a head-direction cortex The organisation of thalamocortical networks follows a conserved structure. Traditionally, these are divided into primary sensory systems that receive…

Really excited to share this Opinion piece we've been working on with fellow head-direction cell geeks @apeyrache.bsky.social @desdemonafricker.bsky.social and (bsky-less?) Andrea Burgalossi! While head-direction cells pop up in many cortical regions, we think that one of them is quite unique (1/8)

15.10.2025 20:10 πŸ‘ 46 πŸ” 18 πŸ’¬ 2 πŸ“Œ 1

Finally preprinted! TL;DR: thalamic head-direction neurons can shape their activity regardless of input. Big thanks to @apeyrache.bsky.social and master experimentalist @sskromne.bsky.social .

16.09.2025 20:25 πŸ‘ 27 πŸ” 6 πŸ’¬ 0 πŸ“Œ 0
SfN 2025

πŸŽ‰ Deadline is *tomorrow*!
Join the @flatironinstitute.org workshop on pynapple & NeMos @sfn.org this November to analyze and model neural data

pynapple: analyze neural time series
NeMoS: model neural population dynamics
Meals + accommodation included
πŸ‘‰ neurorse.flatironinstitute.org/events/2025/...

11.09.2025 17:47 πŸ‘ 5 πŸ” 7 πŸ’¬ 0 πŸ“Œ 1
SfN 2025

⏳ Deadline is next Friday! Apply now to join our #SfN25 workshop on pynapple & nemos. Learn to analyze & model neural data using software developed at @flatironinstitute.org
Accommodations + meals included! πŸ‘‰

09.09.2025 15:22 πŸ‘ 6 πŸ” 6 πŸ’¬ 0 πŸ“Œ 0

True but the projection from LMN to ADN is only forward. Feedback to LMN comes only from PSB. Quite a circuit ! πŸ™‚

10.07.2025 01:27 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Hi Konrad. Nice piece and I know this is not targeted to anatomist but "reciprocal connections between ADN and LMN" is likely incorrrect. If not, could you share the reference?

09.07.2025 15:07 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Hello interested to join. Thanks for making it.

10.03.2025 20:03 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Thank you to everyone who joined us for our first and second Pynapple & Nemos workshops of the year at @flatironinstitute.org , NYC! Stay tuned for future event announcements. #EastCoast

11.02.2025 17:42 πŸ‘ 3 πŸ” 3 πŸ’¬ 1 πŸ“Œ 0