Inlay

I’m studying visual perception, mostly using psychophysics. I work for the CNRS at the Ecole Normale Supérieure in Paris.

Anyone seriously interested in synesthesia should watch this 1994 BBC programme, not just to see a younger Roger Watt! archive.org/details/bbch... And to confirm the end of the video, Kandinsky was indeed a synesthete: philharmoniedeparis.fr/fr/activite/...

Going to VSS this year? I built a free mobile app to organize your schedule. Tap any entry to read the full abstract. Add sessions to a personal schedule and export to Google or Apple Calendar. Works on iPhone and Android via Expo Go app. Just scan the QR code in README: github.com/markwgreenle...

With profound sadness we announce the sudden and unexpected death of our Editor-in-Chief, Tim Meese. A founding editor of i-Perception, Tim was a pillar of the vision science community and instrumental in shaping the landscape of scientific publishing in our field.

Online Now: Perceptual multistability: a multifaceted window into brain dysfunctions

Very nice demo! Contrast reversals of the squares and their edges at different times make a huge difference.

Congratulations Karl! @pec-ipe.bsky.social

In this image, the square tiles look like diamond shapes when light grazes the surface. (The square tiles are actually floor heating elements) Probably related to the coffer illusion by Anthony Norcia.

A classic painting from the Mexican artist Octavio Ocampo. Try rotating the image upside-down if you don't see anything strange at first.

Congratulations to Ian Thornton and colleagues who published their Mainz-Linez illusion in i-Perception (@pec-ipe.bsky.social): the red dots appears to wave left and right when one looks at one of the black dots, but they actually move straight journals.sagepub.com/doi/10.1177/...

A new Department of Cognitive Science is being created at Bocconi University in Milan, Italy. Here is the call for a cluster hire (for around 10 faculty) in all areas of cognitive science, at both junior and senior levels: www.unibocconi.it/en/faculty-a... Deadline: May 4th, 2026

Perceptual multistability, observed across species and sensory modalities, offers valuable insights into numerous cognitive functions and dysfunctions. For instance, differences in temporal dynamics and information integration during percept formation often distinguish clinical from nonclinical populations. Computational psychiatry can elucidate these variations through two primary approaches: (i) Bayesian modeling, which treats perception as an unconscious inference, and (ii) an active, information-seeking perspective (e.g., reinforcement learning), which frames perceptual switches as internal actions. Our synthesis aims to leverage multistability to bridge these computational psychiatry subfields, linking human and animal studies as well as connecting behavior to underlying neural mechanisms. Perceptual multistability emerges as a promising noninvasive tool for clinical applications, facilitating translational research and enhancing our mechanistic understanding of cognitive processes and their impairments.

Perception / i-Perception

Trends in Cognitive Sciences

VSS 2026 scheduler works together with Expo Go (download for free on Apple App Store or Google Play). - markwgreenlee/vss-2026-scheduler

I'll say more about this 1994 BBC Synaesthesia prog later (after shopping). It is well worth its 47mins. It's so rich with positive lived experience. And a lot of it is probably about autism. I would love someone to make something like this about autism. #Autism #ActuallyAutistic 1/4

🎤 ECVP 2026 Perception Lecture Karl Gegenfurtner - University of Giessen Colour Vision — Then and Now Exploring fundamental questions in colour vision using VR, deep neural networks, and large-scale behavioural experiments. Sponsored by Sage – Perception / i-Perception 🎨 #ECVP2026 #ColorVision

The two rows of squares are moving to the right at the same speed; however, the top row appears to be moving to the right, while the bottom one appears to be moving to the left. 上下の正方形の列は等速度で右に動いていますが、上の列は右に、下の列は左に動いているように見えます。

PS A youthful SBC and a youthful me both appear in this BBC Horizon programme "Orange Sherbet Kisses" about synaesthesia (about which I knew literally nothing at the time). archive.org/details/BBCH...