This was a fantastic team effort across 30+ labs 🌍 Paper (open access), data & code all public. > 📄 doi.org/10.1111/desc... > 💻 github.com/manybabies/m... > #ManyBabies #InfantCognition #OpenScience #DevSci, lead team: Andreea Geambaşu, Melanie Soderstrom, and Claartje Levelt
ManyBabies 3: A Multi‐Lab Study of Infant Algebraic Rule Learning
The ability to learn and apply rules lies at the heart of cognition. In a seminal study, Marcus et al. (1999) reported that 7-month-old infants learned abstract rules over syllable sequences and were...
doi.org
September 28, 2026 at 11:36 AM
This was a fantastic team effort across 30+ labs 🌍 Paper (open access), data & code all public. > 📄 doi.org/10.1111/desc... > 💻 github.com/manybabies/m... > #ManyBabies #InfantCognition #OpenScience #DevSci, lead team: Andreea Geambaşu, Melanie Soderstrom, and Claartje Levelt
New paper 🍼📄 ManyBabies 3 is out (open access, registered report in Developmental Science). 30 labs, 33 languages, 839 infants set out to replicate a textbook finding: 7-month-olds learn abstract rules from speech (@garymarcus.bsky.social et al., 1999). We didn’t find it. 🧵
September 28, 2026 at 11:33 AM
New paper 🍼📄 ManyBabies 3 is out (open access, registered report in Developmental Science). 30 labs, 33 languages, 839 infants set out to replicate a textbook finding: 7-month-olds learn abstract rules from speech (@garymarcus.bsky.social et al., 1999). We didn’t find it. 🧵
New ManyBabies publication!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
What 5000 babies can tell us about developing minds and how to study them - Communications Psychology
A decade of ManyBabies research, testing thousands of babies across hundreds of labs, has shown that some, but not all findings in infant research replicate well. Collectively, these projects have sho...
doi.org
June 10, 2026 at 8:55 PM
New ManyBabies publication!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
ManyBabies
ManyBirds
ManyDogs
It sounds like scientists are assembling an army of cuteness.
ManyBirds
ManyDogs
It sounds like scientists are assembling an army of cuteness.
June 4, 2026 at 3:04 PM
ManyBabies
ManyBirds
ManyDogs
It sounds like scientists are assembling an army of cuteness.
ManyBirds
ManyDogs
It sounds like scientists are assembling an army of cuteness.
The recording of our Power Analysis workshop, led by @chrismmcox.bsky.social, is now available on our YouTube page! www.youtube.com/@manybabies
Direct link: www.youtube.com/watch?v=eWCe...
Tutorial materials: 4ccoxau.github.io/PowerAnalysi...
#psychsky #openscience #devpsych #manybabies
Direct link: www.youtube.com/watch?v=eWCe...
Tutorial materials: 4ccoxau.github.io/PowerAnalysi...
#psychsky #openscience #devpsych #manybabies
Workshop: Power Analysis
ManyBabies Workshop: Power AnalysisPresenter Christopher M. M. Cox (Aarhus University) leads an interactive workshop on power analysis. The workshop includes...
www.youtube.com
March 12, 2024 at 9:42 PM
The recording of our Power Analysis workshop, led by @chrismmcox.bsky.social, is now available on our YouTube page! www.youtube.com/@manybabies
Direct link: www.youtube.com/watch?v=eWCe...
Tutorial materials: 4ccoxau.github.io/PowerAnalysi...
#psychsky #openscience #devpsych #manybabies
Direct link: www.youtube.com/watch?v=eWCe...
Tutorial materials: 4ccoxau.github.io/PowerAnalysi...
#psychsky #openscience #devpsych #manybabies
Well, that's a bit of a gut punch... onlinelibrary.wiley.com/doi/epdf/10....
ManyBabies 3: A Multi‐Lab Study of Infant Algebraic Rule Learning
Reader environment loaded
onlinelibrary.wiley.com
September 29, 2026 at 7:34 AM
Well, that's a bit of a gut punch... onlinelibrary.wiley.com/doi/epdf/10....
So excited to see this cool summary of our progress to date! Go ManyBabies!!!
New ManyBabies publication!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
What 5000 babies can tell us about developing minds and how to study them - Communications Psychology
A decade of ManyBabies research, testing thousands of babies across hundreds of labs, has shown that some, but not all findings in infant research replicate well. Collectively, these projects have sho...
doi.org
June 10, 2026 at 9:00 PM
So excited to see this cool summary of our progress to date! Go ManyBabies!!!
Three ManyBabies projects - big collaborative replications of infancy phenomena - wrapped up this year. The first paper came out this fall. I thought I'd take this chance to comment on what I make of the non-replication result. 🧵
bsky.app/profile/laur...
bsky.app/profile/laur...
The Manybabies4 paper is out! Infants' Social Evaluation of Helpers and Hinderers: A Large-Scale, Multi-Lab, Coordinated Replication Study onlinelibrary.wiley.com/doi/abs/10.1... 1000 babies tested in 37 labs; "Overall, 49.34% of infants preferred Helpers over Hinderers in the social condition"
Infants’ Social Evaluation of Helpers and Hinderers: A Large‐Scale, Multi‐Lab, Coordinated Replication Study
Evaluating whether someone's behavior is praiseworthy or blameworthy is a fundamental human trait. A seminal study by Hamlin and colleagues in 2007 suggested that the ability to form social evaluatio...
onlinelibrary.wiley.com
December 3, 2024 at 11:56 PM
Three ManyBabies projects - big collaborative replications of infancy phenomena - wrapped up this year. The first paper came out this fall. I thought I'd take this chance to comment on what I make of the non-replication result. 🧵
bsky.app/profile/laur...
bsky.app/profile/laur...
ManyBabies Demographics paper named an Editor’s Choice article!
Congrats @lehersingh.bsky.social and team!!
Congrats @lehersingh.bsky.social and team!!
February 2024
A unified approach to demographic data collection for research with young children across diverse cultures.
psycnet.apa.org/record/2024-...
3/13
A unified approach to demographic data collection for research with young children across diverse cultures.
psycnet.apa.org/record/2024-...
3/13
APA PsycNet
psycnet.apa.org
December 19, 2024 at 5:16 PM
ManyBabies Demographics paper named an Editor’s Choice article!
Congrats @lehersingh.bsky.social and team!!
Congrats @lehersingh.bsky.social and team!!
Had a great time joining Deon and Jenny to chat about some recent ManyBabies projects!
New episode! In it, we chat with Dr. Martin Zettersten (mzettersten.bsky.social) about a cool ManyBabies project assessing the reliability of infant directed speech! We also chat about his journey & his transition from postdoc to an assistant professor, among other things!
itsinnate.fireside.fm/23
itsinnate.fireside.fm/23
December 20, 2024 at 8:43 PM
Had a great time joining Deon and Jenny to chat about some recent ManyBabies projects!
The recording of our Project Management workshop is now available on our YouTube page (www.youtube.com/@manybabies)
Thanks to @mcxfrank.bsky.social for leading a great event!
Direct link to vid: youtu.be/BmGlx6acRyg?...
#psychsky #openscience #devpsych #manybabies
Thanks to @mcxfrank.bsky.social for leading a great event!
Direct link to vid: youtu.be/BmGlx6acRyg?...
#psychsky #openscience #devpsych #manybabies
February 22, 2024 at 10:42 PM
The recording of our Project Management workshop is now available on our YouTube page (www.youtube.com/@manybabies)
Thanks to @mcxfrank.bsky.social for leading a great event!
Direct link to vid: youtu.be/BmGlx6acRyg?...
#psychsky #openscience #devpsych #manybabies
Thanks to @mcxfrank.bsky.social for leading a great event!
Direct link to vid: youtu.be/BmGlx6acRyg?...
#psychsky #openscience #devpsych #manybabies
New ManyBabies large scale replication study fails to find support for a classic finding by Hamlin and colleagues from 2007 that babies prefer characters that show prosocial behavior. onlinelibrary.wiley.com/doi/10.1111/...
December 1, 2024 at 5:35 AM
New ManyBabies large scale replication study fails to find support for a classic finding by Hamlin and colleagues from 2007 that babies prefer characters that show prosocial behavior. onlinelibrary.wiley.com/doi/10.1111/...
Great thread on the the ManyBabies projects
Three ManyBabies projects - big collaborative replications of infancy phenomena - wrapped up this year. The first paper came out this fall. I thought I'd take this chance to comment on what I make of the non-replication result. 🧵
bsky.app/profile/laur...
bsky.app/profile/laur...
The Manybabies4 paper is out! Infants' Social Evaluation of Helpers and Hinderers: A Large-Scale, Multi-Lab, Coordinated Replication Study onlinelibrary.wiley.com/doi/abs/10.1... 1000 babies tested in 37 labs; "Overall, 49.34% of infants preferred Helpers over Hinderers in the social condition"
December 5, 2024 at 6:03 PM
Great thread on the the ManyBabies projects
New mini perspective zooming out on some takeaways from the first four ManyBabies projects!
New ManyBabies publication!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
Over 10+ years and 5,000+ babies tested, we've learned a ton about how to study the developing mind. In this comment, we discuss three such lessons that are shaping the future of ManyBabies. We'd love to hear your thoughts!
What 5000 babies can tell us about developing minds and how to study them - Communications Psychology
A decade of ManyBabies research, testing thousands of babies across hundreds of labs, has shown that some, but not all findings in infant research replicate well. Collectively, these projects have sho...
doi.org
June 10, 2026 at 11:30 PM
New mini perspective zooming out on some takeaways from the first four ManyBabies projects!
Our mega-analysis of infant-directed speech preference is now out at Open Mind, integrating data from a multi-lab replication (@manybabies.org) and a meta-analysis. w/ @chrismmcox.bsky.social, @chbergma.bsky.social, Maya Mathur, @mcxfrank.bsky.social + a fab team
direct.mit.edu/opmi/article... 1/
direct.mit.edu/opmi/article... 1/
Evidence for Infant-directed Speech Preference Is Consistent Across Large-scale, Multi-site Replication and Meta-analysis
Abstract. There is substantial evidence that infants prefer infant-directed speech (IDS) to adult-directed speech (ADS). The strongest evidence for this claim has come from two large-scale investigati...
direct.mit.edu
April 18, 2024 at 11:03 PM
Manybabies! Here's the MB1 dataset for instance: github.com/manybabies/m...
GitHub - manybabies/mb1-analysis-public: ManyBabies1 analysis code for public sharing
ManyBabies1 analysis code for public sharing. Contribute to manybabies/mb1-analysis-public development by creating an account on GitHub.
github.com
March 4, 2025 at 3:21 PM
Manybabies! Here's the MB1 dataset for instance: github.com/manybabies/m...
Thanks to all who came to our first town hall and participated in a really fun and engaging discussion. If you missed it, we’re doing it again in two days!
Come help shape the future of ManyBabies!
June 6, 2300-2400 UTC
ManyBabies.org/events
Come help shape the future of ManyBabies!
June 6, 2300-2400 UTC
ManyBabies.org/events
June 4, 2024 at 11:01 PM
Thanks to all who came to our first town hall and participated in a really fun and engaging discussion. If you missed it, we’re doing it again in two days!
Come help shape the future of ManyBabies!
June 6, 2300-2400 UTC
ManyBabies.org/events
Come help shape the future of ManyBabies!
June 6, 2300-2400 UTC
ManyBabies.org/events
Meta-analytic plot below: only 1 out of the 31 samples find evidence of the effect. Huge effort from the entire ManyBabies 3 team led by @ingmarvisser.bsky.social. Imo an important moment for reflection in infant research (esp. language development) given the centrality of this finding. 2/2
September 28, 2026 at 4:02 PM
Meta-analytic plot below: only 1 out of the 31 samples find evidence of the effect. Huge effort from the entire ManyBabies 3 team led by @ingmarvisser.bsky.social. Imo an important moment for reflection in infant research (esp. language development) given the centrality of this finding. 2/2
Today's post is on @mcxfrank.bsky.social's book Experimentology, and specifically the chapter on Project Management
experimentology.io/013-manageme...
(full disclosure, I've collaborated on projects with Mike, specifically on ManyBabies, which gets a shout-out in this chapter)
experimentology.io/013-manageme...
(full disclosure, I've collaborated on projects with Mike, specifically on ManyBabies, which gets a shout-out in this chapter)
April 4, 2025 at 4:04 PM
Today's post is on @mcxfrank.bsky.social's book Experimentology, and specifically the chapter on Project Management
experimentology.io/013-manageme...
(full disclosure, I've collaborated on projects with Mike, specifically on ManyBabies, which gets a shout-out in this chapter)
experimentology.io/013-manageme...
(full disclosure, I've collaborated on projects with Mike, specifically on ManyBabies, which gets a shout-out in this chapter)
ManyBabies 3 is a large, cross-linguistic conceptual replication: 650 analysed infants, ages 5–12 months, 33 primary languages, mono- & multilingual, across 3 paradigms (headturn, central fixation, eye-tracking). Stimuli phonologically balanced across languages. 3/
September 28, 2026 at 11:34 AM
ManyBabies 3 is a large, cross-linguistic conceptual replication: 650 analysed infants, ages 5–12 months, 33 primary languages, mono- & multilingual, across 3 paradigms (headturn, central fixation, eye-tracking). Stimuli phonologically balanced across languages. 3/
🚨 New ep! We talk w/ Professor Kiley Hamlin (@jkileyhamlin.bsky.social) about her dev sci path, training w/ legends (Woodward, Wynn, Bloom, Santos), & her Nature Comms paper showing 5-day-olds prefer helpers over hinderers. Plus: reconciling ManyBabies & replication woes.
itsinnate.fireside.fm/31
itsinnate.fireside.fm/31
Moral kombat (with Kiley Hamlin)
itsinnate.fireside.fm
August 8, 2025 at 2:07 PM
🚨 New ep! We talk w/ Professor Kiley Hamlin (@jkileyhamlin.bsky.social) about her dev sci path, training w/ legends (Woodward, Wynn, Bloom, Santos), & her Nature Comms paper showing 5-day-olds prefer helpers over hinderers. Plus: reconciling ManyBabies & replication woes.
itsinnate.fireside.fm/31
itsinnate.fireside.fm/31
Hi everyone, we're here to give BlueSky a try :)
Please send any developmental psychologists or open science enthusiasts our way!
manybabies.org
Please send any developmental psychologists or open science enthusiasts our way!
manybabies.org
ManyBabies
A global consortium of developmental researchers
manybabies.org
July 26, 2023 at 2:42 PM
Hi everyone, we're here to give BlueSky a try :)
Please send any developmental psychologists or open science enthusiasts our way!
manybabies.org
Please send any developmental psychologists or open science enthusiasts our way!
manybabies.org
Wie lernen Babys Regeln?
Dieser Frage ging das internationale Forschungsprojekt ManyBabies 3 nach. Durch die Zusammenarbeit von 30 Forschungslaboren aus verschiedenen Ländern konnten Babys aus unterschiedlichen Teilen der Welt berücksichtigt werden.
Dieser Frage ging das internationale Forschungsprojekt ManyBabies 3 nach. Durch die Zusammenarbeit von 30 Forschungslaboren aus verschiedenen Ländern konnten Babys aus unterschiedlichen Teilen der Welt berücksichtigt werden.
September 24, 2026 at 2:23 PM
Wie lernen Babys Regeln?
Dieser Frage ging das internationale Forschungsprojekt ManyBabies 3 nach. Durch die Zusammenarbeit von 30 Forschungslaboren aus verschiedenen Ländern konnten Babys aus unterschiedlichen Teilen der Welt berücksichtigt werden.
Dieser Frage ging das internationale Forschungsprojekt ManyBabies 3 nach. Durch die Zusammenarbeit von 30 Forschungslaboren aus verschiedenen Ländern konnten Babys aus unterschiedlichen Teilen der Welt berücksichtigt werden.
What should we make of the ManyBabies 'helper-hinderer' investigation? Take a look at my commentary, published in the Conversation.
Are we moral blank slates at birth? A new study offers some clues
Are we moral blank slates at birth? A new study offers some clues
Researchers fail to replicate a seminal study in developmental psychology. Do babies really prefer helpers over hinderers?
dlvr.it
December 27, 2024 at 6:00 PM
What should we make of the ManyBabies 'helper-hinderer' investigation? Take a look at my commentary, published in the Conversation.
🚨4-5 new postdoc positions in language & cognition🚨
😇 One postdoc will work specifically with Eon-Suk Ko and I on the ManyBabies-AtHome project, focusing on infant word recognition in global, remote settings using collaborative, open science practices [https://shorturl.at/5l3tW]. @manybabies.org
😇 One postdoc will work specifically with Eon-Suk Ko and I on the ManyBabies-AtHome project, focusing on infant word recognition in global, remote settings using collaborative, open science practices [https://shorturl.at/5l3tW]. @manybabies.org
April 14, 2025 at 1:09 PM
🚨4-5 new postdoc positions in language & cognition🚨
😇 One postdoc will work specifically with Eon-Suk Ko and I on the ManyBabies-AtHome project, focusing on infant word recognition in global, remote settings using collaborative, open science practices [https://shorturl.at/5l3tW]. @manybabies.org
😇 One postdoc will work specifically with Eon-Suk Ko and I on the ManyBabies-AtHome project, focusing on infant word recognition in global, remote settings using collaborative, open science practices [https://shorturl.at/5l3tW]. @manybabies.org