👨‍🔬 Neuroscientist at the Donders Institute in the Battaglia lab. 🧠 Previously: International Brain Laboratory Using Neuropixels and virtual-reality to understand how the brain creates internal models of the world. www.guidomeijer.comhttps://bsky.app/profile/guidomeijer.comhttps://bsky.app/profile/guidomeijer.com/post/3mvmr5i6f7k23Let me tell you, teaching a course to first year undergrads is a sure-fire way of making you feel really, really old.16 Sep 2026 08:51 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mvmr5i6f7k23https://bsky.app/profile/guidomeijer.com/post/3mscsskx65c23It was great to see the RIKEN institute in Japan and give a talk there. Thanks to Muhang Li and @tommchugh.bsky.social for inviting me!05 Aug 2026 05:39 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mscsskx65c23https://bsky.app/profile/guidomeijer.com/post/3mrwmhdsoq22sIf you're attending the NEURO2026 conference in Kobe, Japan ⛩️ don't miss our symposium on Sunday morning about the latest from the IBL @intlbrainlab.bsky.social. My talk on how neuromodulators shape decision-making starts at 09:55 🧠31 Jul 2026 09:13 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mrwmhdsoq22shttps://bsky.app/profile/guidomeijer.com/post/3mr5hvheqfs2kI am happy to announce my very first senior author paper! Serotonin is known to abolish UP-DOWN state dynamics, which occur during sleep and anesthesia. There are several outstanding questions: What happens at short latencies? How widespread across the brain is it? 🧠 https://www.biorxiv.org/content/10.64898/2026.07.14.738517v221 Jul 2026 09:15 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mr5hvheqfs2khttps://bsky.app/profile/guidomeijer.com/post/3mqqr2dr2hk22Now that my daughter can say a few words I feel like being a servant to a neanderthaler. I'm constantly being shouted at "food!", "give!", "yes good, more more!"16 Jul 2026 07:54 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mqqr2dr2hk22https://bsky.app/profile/guidomeijer.com/post/3mqbiwhmhjk2lI wonder which layer of hell Dante reserved for the developers of the FENS app10 Jul 2026 06:19 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mqbiwhmhjk2lhttps://bsky.app/profile/guidomeijer.com/post/3mq2vfa4e5223Thanks to all who visited my poster for your interest and lively discussions 😃07 Jul 2026 15:13 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mq2vfa4e5223https://bsky.app/profile/guidomeijer.com/post/3mpxq2wboe22pI'm on my way to Barcelona for #FENS2026! 🌞🧠Come see my poster tomorrow morning: PS01-07AM-292 - DYNAMIC UPDATING OF REWARD PREDICTIONS BY THE PARA-HIPPOCAMPAL NETWORK I did simultaneous Neuropixel recordings in CA1 and 5 cortical regions to find out how the brain switches between cognitive maps 🗺️06 Jul 2026 09:00 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mpxq2wboe22phttps://bsky.app/profile/guidomeijer.com/post/3mpdpt65jqk2iIdea for an app!💡 World Cup football matches are often in the middle of the night for us Europeans; the Netherlands is playing at 3AM 💤 I want an app that wakes me at 5:30AM to see the penalty shoot outs, but only if there are any. Can someone who doesn't have a 2 year old develop this? Thanks! 🙏🏻28 Jun 2026 10:02 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mpdpt65jqk2ihttps://bsky.app/profile/guidomeijer.com/post/3mo3h2gvhuc2gI wonder how many unnecessary figure panels have been made just to make the entire figure nice and rectangular.12 Jun 2026 09:39 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mo3h2gvhuc2ghttps://bsky.app/profile/guidomeijer.com/post/3mntmjg2un22nWant your mice to learn your task faster? 🐭 According to this paper giving a huge reward (10x typical size) in a subset of trials strongly shortens training times: https://www.science.org/doi/10.1126/science.aeb081309 Jun 2026 06:56 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mntmjg2un22nhttps://bsky.app/profile/guidomeijer.com/post/3mlvd7luphk25zetapy v4.0 is live! Due to various optimizations of the code it now runs 4x faster⚡Upgrade now and get your significant neurons in no time! pip install zetapy==4.015 May 2026 12:24 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mlvd7luphk25https://bsky.app/profile/guidomeijer.com/post/3mlatooel6s2kAre you interested in serotonin receptors? I made a website which visualizes the expression of different 5-HT receptors! Data from the Allen Brain Atlas (@alleninstitute.org) website by the IBL Brain Viewer (@intlbrainlab.bsky.social). atlas.internationalbrainlab.org?buckets=meij... Instructions 👇 https://atlas.internationalbrainlab.org/?buckets=meijer_5ht_receptors&bucket=meijer_5ht_receptors07 May 2026 08:53 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mlatooel6s2khttps://bsky.app/profile/guidomeijer.com/post/3ml45tuzqvs2zI've been watching Fireman Sam with my daughter (the new animated version) and I must say I'm deeply worried for the residents of Pontypandy, the small Welch village with a population of apparently 10 people. A thread 🧵05 May 2026 12:11 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3ml45tuzqvs2zhttps://bsky.app/profile/guidomeijer.com/post/3ml3xvmros22pI'm very happy that fairness and reason has prevailed and the ERC has backtracked on this. Thanks to everyone who signed the open letter to the ERC for making this happen 🙏🏻 https://www.thetransmitter.org/policy/european-research-council-backtracks-on-stricter-grant-resubmission-rules/ [contains quote post or other embedded content]05 May 2026 10:25 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3ml3xvmros22phttps://bsky.app/profile/guidomeijer.com/post/3mjovx3amzk2gThe ERC is changing the rules retroactively! A "B" grade now carries a 2-year timeout instead of 1, even for those who submitted under the old rules. Researchers (incl me) make massive career decisions based on these timelines, you can't change them after the fact 😵‍💫 https://erc.europa.eu/news-events/news/erc-president-explains-stricter-application-measures-amid-rising-demand-funding17 Apr 2026 12:20 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mjovx3amzk2ghttps://bsky.app/profile/guidomeijer.com/post/3mfqqbziqj222The Power Pixels ⚡ pipeline is out now in Peer Community Journal! Are you doing Neuropixel recordings but don't have a pre-processing pipeline yet? Check out this end-to-end pipeline designed to simplify preprocessing of Neuropixel recordings 🧠 https://peercommunityjournal.org/articles/10.24072/pcjournal.679/26 Feb 2026 08:03 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3mfqqbziqj222https://bsky.app/profile/guidomeijer.com/post/3m5dzn6eugk2xThe Power Pixels pipeline just keeps getting better! The latest update comes with: - OpenEphys support - AP_Histology support - automatic high-frequency noise reduction - NWB format export option - zarr compression of raw data And, most importantly: a cool new logo! https://github.com/NeuroNetMem/PowerPixelsPipeline11 Nov 2025 11:25 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3m5dzn6eugk2xhttps://bsky.app/profile/guidomeijer.com/post/3m4i5cgd6uk22Halloween isn’t my thing. My idea of a scary night is reading the plots of horror movies on Wikipedia.31 Oct 2025 09:16 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3m4i5cgd6uk22https://bsky.app/profile/guidomeijer.com/post/3m3z5qffxrs25I never understood why everyone always complains about the clocks changing. Then I had a kid.25 Oct 2025 10:13 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3m3z5qffxrs25https://bsky.app/profile/guidomeijer.com/post/3m3cdjoedfk2lWant to make publication-ready figures come straight from Python without having to do any manual editing? Are you fed up with axes labels being unreadable during your presentations? Follow this short tutorial including code examples! 👇🧵16 Oct 2025 08:26 +0000at://did:plc:vwg3hsc63gl3qaqlw4rdvkbg/app.bsky.feed.post/3m3cdjoedfk2l