#EEGManyLabs
@eegmanylabs
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We are international network of researchers, aiming to make a step towards understanding replicability of findings from EEG research
Joined March 2021
We are creating EEG brain growth charts by harmonizing resting EEG across labs! Have resting EEG data? Interested in authorship opportunities on the seminal brain growth charts paper? Respond here: https://t.co/Lyr9tjPkMR Team Leads: @STRscience @SantiMoralesPhD @georgebuzzell
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Follow #EEGManyLabs on X and Bluesky for updates, threads on specific studies, and new Stage 2 results as they appear. Share the site with your lab and collaborators. Let’s build better EEG together.
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Huge thanks to our community. Your contributions power inclusive, rigorous, high-impact EEG science.
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Cap-E will guide you through related projects, spin-offs, and associated initiatives. This includes EEG100 celebrating 100 years of EEG (see https://t.co/5HXH6t8eJL) and the pan-European network EEG101 COST Action ( https://t.co/Fcm3GxSclT).
cost.eu
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We are also introducing our new mascot, Professor Cap-E (thank you to Aleksei Medvedev for the design).
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It is not too late to join a replication team. Several projects are still recruiting new labs. You will find sign-up forms on the Replications page.
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You will find Stage 1 protocols and Stage 2 results, with links to data, code, and materials. Including a recently completed 22-lab replication of the foundational N2pc study by Eimer (1996):
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The #EEGManyLabs website is now live: https://t.co/DNwiTBBQnR A home for our global effort to test the replicability of influential EEG findings, share resources, improve methods in cognitive neuroscience, and grow an open, connected community.
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The first published paper to emerge from @eegmanylabs settles a debate 20 years in the making. Read more in this month’s Null and Noteworthy. By @LauraLauraDat
https://t.co/vjN9dY5UH2
thetransmitter.org
The first published paper from #EEGManyLabs’ replication project nullifies a null result that had complicated a famous reinforcement learning theory.
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PhD opportunity! 📣 Are you interested in coming to study a fully funded #PhD 🎓 with me (principal supervisor) and co-supervisors Prof Jonathan Hill and @steph_ainsworth at @ManMetUni on an EEG study investigating social cognition in young adults and adolescents? More info:
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This is just the first in our #EEGManyLabs series—showing how collaborative EEG science can refine major theories. Watch this space for more. In the meantime, read the full paper for the deep dive: https://t.co/KlhpineNtI Huge thanks to all labs involved!
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One of the best parts? ✅ Minimal heterogeneity. ✅Across different EEG systems & participant samples, the pattern held strong, suggesting we have a robust and generalizable result.
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The P300 also wasn’t as simple as “expectancy-only: we found both expectancy and valence effects. This implies that feedback evaluation is spread across multiple stages, rather than being sharply split into “FRN for valence” and “P300 for expectancy.”
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The original study had only 17 participants—typical for its time but underpowered (~40% power). Our larger sample detected the small-to-moderate expectancy effect (ηp² = .08—identical to the original!). 🚫 Reminder: Absence of evidence ≠ Evidence of absence!
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🚨 Results: The FRN isn’t just about valence! 🚨 It was significantly modulated by both: ✅ Valence (reward vs. no reward) ✅ Expectancy (expected vs. unexpected) These results align more with Holroyd & Coles’ prediction error theory than Hajcak et al.’s original conclusion.
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We put this to the test across 13 labs with 359 participants worldwide—a massive jump from the original n=17! Our goal? 🧐 🔍 Does the FRN really ignore expectancy? 🔍 Is the P300 only about surprises?
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A new “two-stage” model proposed: ✅ FRN tracks valence (good vs. bad outcome) ✅ P300 tracks expectancy (surprise factor) With 600+ citations, this study has shaped how researchers interpret feedback-locked ERPs.
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But Hajcak et al. (2005) found something different: They found the FRN only distinguished reward vs. no reward, NOT whether an outcome was expected. 🤯 This challenged Holroyd & Coles’ reinforcement-learning theory and led to a new interpretation of feedback processing.
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The original study (Hajcak, Holroyd, Moser, & Simons, 2005) tested a highly influential idea: Holroyd & Coles (2002) reinforcement learning model proposed that the FRN (feedback-related negativity) signals a better/worse-than-expected dopamine-driven prediction error.
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🚨Exciting news! We now have the first-ever complete #EEGManyLabs replication. This large-scale multi-site study revisits a key debate in EEG & reinforcement learning. A thread! 🧵👇 📄 Full paper:
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