Deeply honoured and very humbled to have received the 2026 Kurt Koffka Medal. Many thanks to the committee at the University of Giessen! www.uni-giessen.de/fbz/fb06/psy...

How meaningful is it to search for the minimal exposure duration of a stimulus to understand visual perception? With Mark Wexler, we wrote a commentary on the article of Lanfranco et al., Nat. Commun., 2024: www.nature.com/articles/s41...

The meaningfulness of searching for minimal exposure duration to understand visual perception - Nature Communications

Nature Communications - The meaningfulness of searching for minimal exposure duration to understand visual perception

nature.com

(1/6) My first first-author paper is now out in @nconsc.bsky.social! Part of my PhD work with @mamassian.bsky.social at @lsp-ens.bsky.social. We looked at how confidence behaves during a perceptual learning task with no feedback. academic.oup.com/nc/article/2...

Perceptual learning without feedback is accompanied with systematic changes in confidence processing

Abstract. Perceptual learning can occur without external feedback, raising questions about what internal signals might guide this learning. Here, we test t

academic.oup.com

In their recent BBS article (doi.org/10.1017/S014...), Steve Fleming (@smfleming.bsky.social) and Matthias Michel (@matthiasmichel.bsky.social) discuss the slowness of conscious vision and the predictions generated by an internal model of the world. 1/2

Lovely to see the full range of excellent commentaries on our BBS article with @matthiasmichel.bsky.social, together with our response, now out: Target article: www.cambridge.org/core/journal... Commentaries: www.cambridge.org/core/journal... Our response: www.cambridge.org/core/journal...

Matthias Michel@matthiasmichel.bsky.social · last yr.

Very happy to announce that our paper “Sensory Horizons and the Functions of Conscious Vision” is now out as a target article in BBS!! @smfleming.bsky.social and I present a new theory of the evolution and functions of visual consciousness. Article here: doi.org/10.1017/S014.... A (long) thread 🧵

Open post-doc position in the study of perceptual fluctuations Position: post-doctoral (2 years) Locations: Paris, France (Ecole Normale Supérieure / CNRS) and Lausanne, Switzerland (University of Lausanne / CHUV) Deadline: September 4th, 2026 Start Date: Fall 2026 (with some flexibility) (1/8)

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.

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

Akiyoshi Kitaoka@akiyoshikitaoka.bsky.social · 2mo ago

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。

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...

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

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

github.com

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

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/...

Roger Watt@rjwatt42.bsky.social · 4mo ago

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

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

Perceptual multistability: a multifaceted window into brain dysfunctions

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.

dlvr.it

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.

Congratulations Karl! @pec-ipe.bsky.social

ECVP 2026@ecvp.bsky.social · 4mo ago

🎤 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

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

Now published in Perception (@pec-ipe.bsky.social)! Schulz-Hildebrandt, H. (2026). When purple perceived only at fixation: A fixation- and distance-dependent color illusion. Perception, 0(0). doi.org/10.1177/0301...

When purple perceived only at fixation: A fixation- and distance-dependent color illusion - Hinnerk Schulz-Hildebrandt, 2026

In this paper, an optical illusion is described in which purple elements are perceived as purple at the point of fixation, while surrounding elements of the sam...

doi.org

Pascal Mamassian@mamassian.bsky.social · 11mo ago

A nice shift in perceived colour between central and peripheral vision. The fixated disc looks purple while the others look blue. The effect presumably comes from the absence of S-cones in the fovea. From Hinnerk Schulz-Hildebrandt: arxiv.org/pdf/2509.115...

The European Summer School "Visual Neuroscience" in Rauischholzhausen castle, Germany, is coming back in 2026! Deadline: 8 March 2026 www.allpsych.uni-giessen.de/rauisch/

Our latest paper, “Visual language models show widespread visual deficits on neuropsychological tests”, is now out in Nature Machine Intelligence: www.nature.com/articles/s42... Non-paywalled version: arxiv.org/abs/2504.10786 Tweet thread below from first author @genetang.bsky.social...

Visual language models show widespread visual deficits on neuropsychological tests - Nature Machine Intelligence

Tangtartharakul and Storrs use standardized neuropsychological tests to compare human visual abilities with those of visual language models (VLMs). They report that while VLMs excel in high-level obje...

nature.com

The CNRS (@cnrs.fr) and the Ecole Normale Supérieure/PSL University (@normalesup.bsky.social) is launching a 5-year International Research Project (IRP) with University College London (@ucl.ac.uk) on human perception and consciousness. www.ucl.ac.uk/global/news/...

UCL launches landmark European collaboration on perception science

UCL is working with top French partners CNRS and ENS – PSL on a major European research initiative to advance understanding of human perception and consciousness.

ucl.ac.uk

We're running a 5th edition of the always-exciting UCL Summer School on Consciousness and Metacognition this year, 8th-10th July 2026 in London. Accommodation and travel expenses are covered. For more information and how to apply, check out metacoglab.org/summer-schoo...

1/ 📢 Come study cognitive science in Paris! The Master’s program in Cognitive Science at @ENS_ULM, @psl_univ, and @EHESS_fr is now accepting applications for the next academic year. 🗓 Deadline: February 24, 2026 💻 Apply here: master-cognitive-science.ens.psl.eu/en/applicati...

Are we ready to tackle perceptual segmentation of natural scenes? Finally the review on perceptual segmentation you’ve been waiting for! www.sciencedirect.com/science/arti...

🎉 Excited to share this! Low-level, naturally formed priors influence our perceptual inferences, but do they impact our confidence in the same way? With @elifilevich.bsky.social and @mamassian.bsky.social we found: they influence confidence even more strongly! More👇 1/5 dx.plos.org/10.1371/jour...

Long-term perceptual priors drive confidence bias that favors prior-congruent evidence

Author summary Prior expectations play a critical role in shaping not only the perceptual inferences that we make, but also how confident we feel about those inferences. Bayesian confidence models cap...

dx.plos.org

This head is spinning continuously, but we see it rotating back and forth... ...presumably because of our strong prior expectation that faces are convex. This is a very nice example of the Hollow-Face illusion promoted by Richard Gregory: www.richardgregory.org/experiments/

Exposition Bridget Riley et Seurat au musée d’Orsay jusqu’au 26 janvier, l’artiste presque centenaire, gloire de l’art cinétique, eu la révélation des interactions des couleurs en copiant Seurat en 1959. L’occasion rare de faire l’expérience sensible des liens reliant ces 2 géants de la perception

Congratulations Sara and Guido! The two of you look beautiful!

Guido Maiello@guidomaiello.bsky.social · 8mo ago

Sara and I got married last Friday (12.12.2025) ❤️It was a lovely day. As always, things are slightly complicated, but Sara is amazing. Full update: gofund.me/b127be3ca

Great new initiative from the editors of Perception: Philosophy Corner. A forum for "accessible reflections on the conceptual foundations of sensory/perception science where empirical insight meets philosophical inquiry". journals.sagepub.com/doi/full/10....

Introducing Philosophy Corner - Tim S. Meese, Pascal Mamassian, Isabelle Mareschal, Frans A.J. Verstraten, 2025

journals.sagepub.com

L’ancêtre du camouflage, crée pour la 1ere guerre mondiale, pour des navires de guerre. Les rayures empêchent de déterminer la vitesse, entraine la confusion et rend imprécis les tirs…

Brian Groom@groomb.bsky.social · 8mo ago

Dazzle Ships in Drydock, Liverpool, 1919, painting by Edward Wadsworth. Dazzle camouflage was created in WW1 to protect British ships from German artillery, making it difficult to estimate speed and direction. Wadsworth supervised design of camouflage patterns. #NorthernArt

Congratulations Dr Nadia Hosseinizaveh! It was an honour to work with you. And thank you to your PhD committee for the great discussion, @nfaivre.bsky.social Bahador Bahrami @clairesergent.bsky.social @opheliaderoy.bsky.social Frédérique de Vignemont

LSP-ENS@lsp-ens.bsky.social · 8mo ago

Congratulations to @nadiahosseinizaveh.bsky.social on a brilliant PhD defense: "Evolution and Dynamics of Perceptual Confidence: From Perceptual Learning to Global Confidence Formation". Impressive work advancing our understanding of perception and metacognition.