Come and check out our poster at #CCN2025, presented by @tlmnhut.bsky.social

• Early visual areas showed a linear number line.
• Parietal and ventral regions showed a curved manifold, separating extremes from middle numerosities.

Possible interp.:
🔸 Numerosity-tuned coding @jacobmpaul.bsky.social aul.bsky.social‬
🔸 Decision-variable encoding @summerfieldlab.bsky.social

🧠 We replicate Castaldi et al. (2019), showing numerosity is encoded independently of other visual features along the dorsal stream.

🔍 We extend this to the ventral stream, where number representations were often neglected, aligning with topographic maps reported by @sergedumoulin.net & Harvey.

Our approach built on Castaldi et al. (2019) and combined:
🔹 RSA—to quantify how numerical and non-numerical features are encoded
🔹 Multidimensional Scaling (MDS)—to visualize the neural geometry of numerosity representations

This allowed us to isolate number representations from visual confounds.

We used fMRI in 31 adults performing a numerosity estimation task.
Visual arrays varied in:
• Number of dots
• Item size
• Total area
• Density

✅ Critically controlled for visual confounds to isolate genuine number representations.

New paper out in @commsbio.nature.com!
@elicastaldi.bsky.social, Evelyn Eger, @manpiazza.bsky.social

🔢 We reveal how the brain represents numerosity across the entire visual system, from early visual areas to high-level association cortices.

👇 A thread
🔗 www.nature.com/articles/s42...

🎉 New Chapter Published!

🧠 Title:
Neurobiological underpinnings of developmental dyscalculia
👥 Authors:
Paula A. Maldonado Moscoso, @alirezakr.bsky.social , @manpiazza.bsky.social

#Neuroscience #CognitiveNeuroscience #LearningDisabilities #Dyscalculia

Excited to share our work with @tlmnhut.bsky.social at the NeurIPS Workshop on Behavioral Machine Learning! 🧠

Come visit our poster!

#NeurIPS2024 #BehavioralML #Numerosity #DeepLearning