Aside from testing the MR view, we offer a new theoretical take on why kids fail. Kids conceptualize the goal of object retrieval tasks exactly as adults do betting. When we bet on horses, we don't spread bets across all options, but try to pick a winner. When FORCED to spread bets, kids succeed.

New preprint w @carenwalker.bsky.social & @drbarner.bsky.social! We test the "minimal representations" hypothesis that explains gaps in 3yos modal reasoning. Against it, we find that even 2½yos reason about mutually exclusive possibilities... when goals are clear to them. osf.io/preprints/ps... 1/6

Fun little review paper w/ @drbarner.bsky.social, in which we discuss the role of language in the development of exact number concepts! 1/5 osf.io/preprints/ps...

One-year-olds watching cartoon characters help each other don’t necessarily expect a helper to also help new characters, suggesting that infants assume prosocial behavior is based on relationships rather than innate dispositions. In PNAS: https://ow.ly/6bTH50YPGUo

New pre-print alert! How do children learn magnitude words like "long" and "high", which often denote multiple domains? With @urvi.bsky.social and @drbarner.bsky.social, we find that children start with narrow meanings restricted to the labeled domain, before analogically extending osf.io/ucxra_v1

New paper in Child Development! When we enter others' homes, we learn about them from the placement of their belongings. This requires integrating multiple social factors (social context, pref). We find 6+yo succeed at integration & 'read the room' in this way! academic.oup.com/chidev/artic...

This book has just been published, open access, edited by Ken Cheng and me. It contains multiple chapters originating in a wonderful Strungmann Forum held in Frankfurt around a year ago. link.springer.com/book/10.1007...

A short history of time - and why we have 60 minutes in an hour, 24 hour days and a seven day week. fascinating piece on how everything about time is a human construct www.bbc.com/future/artic...

🎉Our paper was just accepted in Cognition!🎉 Title: Training “Zero” in Preschoolers: Fast Referential Learning, Slow Relational Integration Authors: Yanfei Yu, Marianna Thorne, David Barner @cognitionjournal.bsky.social @drbarner.bsky.social

I'm hiring a new lab manager for my lab @ UCSD! For more info on the lab, check out our website: lillab.ucsd.edu Target start date is June 1 (flexible) and application deadline is March 26. Please share with anyone you think might be a good fit! Apply here: employment.ucsd.edu/laboratory-c...

Some calendar systems really are transparent in this way!!!

My book is now published! 🌏🎶🧪
 You can download it for free at academic.oup.com/book/62353 - I’d be grateful if you do! I also published an accessible summary with audio/video today in @nature.com: www.nature.com/articles/d41... Try reading that first, then give the whole book a read if you like it!

Research plug: we're currently seeking (bilateraly, congenitally) blind adults & Deaf adults for a *paid* online research study (screen reader compatible) on how individuals experience words across perceptual modalities. Ping [email protected] if interested! Reposts welcome! #Blind #Deaf

📚 Reading Women in Cognitive Science 📚 “Recommendations for readings are welcome, especially in the history of cognitive science (prior to 1950s, and the older the better).” irisvanrooijcogsci.com/2026/02/15/%...

Very cool new article by @urvi.bsky.social, Jessica Sullivan and @drbarner.bsky.social comparing English and Hindi speaking kids' ideas about infinity, showing a subtly more complicated view of how numerical morphological opacity relates to infinity beliefs. www.sciencedirect.com/science/arti...

We're starting a PhD programme in Philosophy at Ashoka! Anyone can apply by April 15 for admission this year, and we will ensure that admitted applicants receive enough funding to support them for the 5 year programme. More info here: www.ashoka.edu.in/programme/ph...

It never ends (you’ll see): another paper from @urvi.bsky.social this time on how language structure impacts children’s intuition that numbers are infinite (see?)!

By age 6, many children in the US believe that numbers are infinite, despite initially representing counting as a meaningless & finite chain of words. In a new paper w/ Jess Sullivan & @drbarner.bsky.social, we explored the basis for this conceptual change. 1/n www.sciencedirect.com/science/arti...

The Visual Learning Lab is hiring TWO lab coordinators! Both positions are ideal for someone looking for research experience before applying to graduate school. Application deadline is Feb 10th (approaching fast!)—with flexible summer start dates.

Really cool new project from @urvi.bsky.social that finds that kids are much better at temporal reasoning than previously reported, if we test them with REAL passing time, rather than hypothetical past or future events and differentiate past and future at 3 years old.

New w/ @drbarner.bsky.social! We argue that children's struggle to represent the past and future in common tests of knowledge may stem from difficulties in hypothetical reasoning about imaginary timelines, rather than a lack of knowledge about time. 1/n academic.oup.com/chidev/advan...

Had an intriguing editorial discussion recently: how did people in the past talk about 'minutes' when they didn't have watches or standardised times? How does that affect your thinking? Come down an Elizabethan/Jacobean rabbit hole with me. 1/

Can humans & animals really use internal maps to take shortcuts? Tolman famously said yes - based largely on his Sunburst maze. Our new review & meta-analysis suggests evidence is far weaker than you might think. 🧵👇 doi.org/10.1111/ejn.... @uofgpsychneuro.bsky.social @ejneuroscience.bsky.social

Super cool study led by Haleh Yazdi - a simple demonstration that applying oft-used measures to novel contexts isn’t enough for inclusive & effective cross-cultural research. Measures designed for western populations do not always capture cross-cultural variability, nor within-group patterns.

A common problem w/ studies testing non-WEIRD groups is they compare multiple groups using the same WEIRD measure. How can we compare groups w/ apples-apples measures w/o distorting cross-cultural differences? We explore this in this new paper! onlinelibrary.wiley.com/doi/10.1111/...

Now accepting abstracts for MCLS 2026! Check out the announcement below for more information.

Re-upping this ad for open postdoctoral position in my lab working with longitudinal fNIRS and EEG data from preschool children--especially interested in applicants with strong longitudinal modeling skills publish.illinois.edu/danielchyde/...

New pre-print with @drbarner.bsky.social! We ask how children come to understand age. We find that young children use numerical age and facial morphology to identify who’s older, not just size, and point to acquiring a number system as key to developing an understanding of age. osf.io/gvb46

Happy to share this new entry on numerical cognition for the OECS. Thanks to @hbaum.bsky.social and @mcxfrank.bsky.social for making this happen! Apologies if your work isn’t cited! Had to limit cites!!! oecs.mit.edu/pub/rek9756r...

Stephen Van Hedger & I have a short piece on language and music interactions in the brain, in this cool new book by Edna Andrews and Swathi Kiran (appearing alongside some fab perspectives on language processing in the brain!)

A quick (1000 words) read to enjoy with your morning coffee or afternoon tea: "Psychology wants to stay WEIRD, not go WILD" Why hasn't psychology diversified it samples, methods, theories, etc.? Because it doesn't want to. osf.io/preprints/ps...

Shopping for a hot take on nativism? Here's an argument that "strong nativist" accounts of concepts (here, numerical concepts) often fail to explain ontogenesis because they lack an account of "rational causation" - i.e., how innate contents are brought to bear in experience osf.io/preprints/ps...

It’s grad school application season, and I wanted to give some public advice. Caveats: -*-*-*-* 
> These are my opinions, based on my experiences, they are not secret tricks or guarantees 
> They are general guidelines, not meant to cover a host of idiosyncrasies and special cases

Super fun paper on the role of sensorI-motor procedures in 1-to-1 set matching in blind children and adults, with the effulgent @urvi.bsky.social . Procedures that blind kids use for counting 1-1 don’t help set matching 1-1 unlike in sighted kids!

Just in: @drbarner.bsky.social & I find that blind adults and children who have symbols for large numbers, and use 1:1 correspondence to count, do not extend a similar 1:1 strategy to a set-matching task, which assesses their knowledge of Hume’s principle. A 🧵: www.sciencedirect.com/science/arti...

My paper "Base structures across lexical and notational numeral modalities" (PhilTransB) addresses a whole class of questions around the role that semiotic modality, and specifically number words vs. number symbols, plays in the structure of numerical systems.

Very excited to announce my student Andreas Arslan's first paper, "Causal coherence improves episodic memory of dynamic events" in Cognition! Out now open access: www.sciencedirect.com/science/arti... Andreas isn't on bsky, but he very kindly wrote a summary thread for me to share. 🧵 (1/24)

Now out in Open Mind! @drbarner.bsky.social and I find that when people hear a conditional statement like “If you mow the lawn, you’ll get $5,” they often interpret it as “only if you mow the lawn”, a pragmatic, perfected meaning. doi.org/10.1162/opmi...

A new way of looking at some debates in the Philosophy of Time. Now published. www.tandfonline.com/eprint/3MSIW...

New from me and @esranur.bsky.social! In two exps with 3-4-year-olds, we find no differences in kids' reasoning about possible outcomes of an event in different temporal contexts; kids perform the same under physical and epistemic uncertainty psycnet.apa.org/record/2026-... #devpsy #psychscisky

Fun new paper led by Sebastian Holt, training adults on artificial number systems. Most work tests only base-10 learning; we trained adults on a range of base systems & manipulated whether numbers were learned as part of a counting system, or unordered words. onlinelibrary.wiley.com/doi/10.1111/...

If you haven't been looking recently at the Open Encyclopedia of Cognitive Science (oecs.mit.edu), here's your reminder that we are a free, open access resource for learning about the science of mind. Today we are launching our new Thematic Collections to organize our growing set of articles!

So excited to share my *first* first-author paper, out now in @cp-trendscognsci.bsky.social!! In this review, we argue that even if you don’t remember being a baby, evidence that infants form episodic-like memories is actually all around us: authors.elsevier.com/c/1l82g4sIRv...

UC San Diego Psychology hosted the first Southern California Meeting for Investigations in Developmental Science (SoCal MInDS) this Saturday. We were joined by wonderful folks from the southernmost UC campuses, SDSU, CSULA, Occidental College, and USC.

How are humans able to make sense of time? Not with special biology but with “time tools”—ideas, practices, and artifacts that render time more concrete. My new paper explores this vast, varied toolkit—one that makes use of knots, nuts, hands, flowers, mountains, shadows, and much more. (link 👇)

Out now! @drbarner.bsky.social & I find that Hindi kids learn yesterday & tomorrow earlier than English kids, despite having only word 'kal' to reference both the past and future. We argue that kids rely on tense info (over associations w/ events) to learn. onlinelibrary.wiley.com/doi/10.1111/...

Honored that a piece I wrote made it to NYTimes. It’s about how my mom’s stroke changed my connection to time, science, and nature. What a privilege to honor my mom in Modern Love. Below is a gift link. Let me know your thoughts 🙏🏼 www.nytimes.com/2024/12/20/s...

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...

New preprint w @drbarner.bsky.social!TL;DR: even 3yos comprehend yesterday & tomorrow when tested on consecutive days, 1-2 years earlier than in other studies! BUT still struggle w hypothetical events. Tasks in which time actually passes maybe more sensitive to early time concepts! osf.io/gs3r4/

We're launching Devstart, a website to help anyone getting started with developmental science methods and programming. Here's the website with the first tutorials: tommasoghilardi.github.io/DevStart/ Please share widely! 1/4