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Nuno De Sá Teixeira

@nunodesateixeira.bsky.social
1.6K followers 5K following 72 posts

Assistant Professor in Experimental Psychology and Researcher on Psychophysics and Visual Perception. Avid reader of non-fiction. Amateur astrophotographer, fencer, and musician. Personal Website: www.kymograph.pt

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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 11/09/2026
Many of us take for granted the ability to see stereograms with cross-eyed and/or parallel viewing, but some students struggle with it. I’ve therefore wrote this comprehensive guide, from the basics to autostereograms. Feedback and corrections are very welcome! www.kymograph.pt/en/teaching/...
kymograph.pt
How to see 3D images without any equipment (apart from your eyes) – From simple stereograms to autostereograms | Kymograph
Person website of Nuno De Sá Teixeira — research, teaching, and resources on perception, psychophysics, and experimental psychology.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 15/08/2026
A handy, interactive demonstration of the Müller-Lyer illusion, made from card. I keep this one around, as it has proven useful for a few topics in my classes. You can find the print-ready file to build your own on my website, here: www.kymograph.pt/en/teaching/....
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 28/03/2026
Dear face perception folks - I 3D printed some greebles (so far just the Samar family) mostly because I could. Now I’m wondering: these might actually be useful as teaching tools or even for experiments. Any ideas for cool/fun/clever things to do with physical greebles? #FacePerception
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 11/03/2026
A bit of bricolage and shadow play.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 24/02/2026
I found this under the sofa. It’s been 24 hours, and everyone here is fine. One of the cats is acting a little strange, though - most likely due to something it ate. Nothing to worry about.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 18/02/2026
Perfect for a perception scientist with a taste for Hamlet, or an unapologetic Holbein enthusiast. (3D Model found here: www.printables.com/model/616483...)
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 05/02/2026
If books were people, I’d introduce these two to each other. I’m sure they’d get along perfectly; and I enjoyed spending time with both.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 16/01/2026
It took just over 24 hours to print, and I had to use whatever colours I had available, but it could be helpful for hands-on students. The 3D model can be found here: www.printables.com/model/207798...
3D model of a human brain3D model of a human brain3D model of a human brain
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Cody @codyjohnston.bsky.social · 03/10/2025
New episode about the thing that happened, the reaction to it, and the reaction to the reaction to the thing that happened. youtu.be/nD3rSA4FSqk?...
youtu.be
... Can We Talk? - SOME MORE NEWS
YouTube video by Some More News
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 17/09/2025
A new addition to my personal library, thanks to Bluesky's #visionscience community (even if in the sequence of a sad new).
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 28/08/2025
Thank you all for the great feedback and insightful questions on my poster "Exploring Action-Specific Effects: A Representational Momentum Study of the ‘Pong Effect’" at #ECVP2025. It was a wonderful conference and I am already looking forward to the next one!
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 26/08/2025
Shout-out to Rodrigo Freita's presentation of our work "Dynamic events as a natural cause for the Onset Repulsion Effect" at #ECVP2025. We had a great feedback and fruitful discussions.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 28/07/2025
It's taking me forever to read this book because my brain insists in emulating Bernie's distinctive voice tone...
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Cody @codyjohnston.bsky.social · 02/07/2025
Here's our new episode about that guy trying to talk. Alternate title is "The Right-Wing War On Words", but we couldn't resist. youtu.be/1yjIeZCddUQ?...
youtu.be
LOL Jordan Peterson - SOME MORE NEWS
YouTube video by Some More News
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 06/06/2025
Yesterday was our "Illusion Day", with interactive demonstrations of classic perceptual illusions made by my students of Attention&Perception. It was the first time I attempted this activity with a class and it was definitely a success! Will repeat it next year! (more illusions in the comments)
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 15/04/2025
It is my conviction that the time required for a Matlab script to finish is directly proportional to its understandability (or, stated differently, the most efficient scripts are necessarily more obscure and harder to understand)
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 13/04/2025
This is the output of my modest Matlab implementation of Marr&Poggio's cooperative algorithm for stereo disparity. With less than 100 lines of code, it is not efficient, the parameters need to be tweaked for each simulation and only works in Flatland, but it makes the core ideas clear for students.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 11/04/2025
Trumps' administration rescinded a program with Portuguese Universities (including the one where I work) along with a questionnaire on ideological issues (women's rights, equity, inclusion, global warming, etc), hinting that continuation of the program hinges on giving the "right" answers... 😡
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 19/03/2025
When your father is a vision scientist and has a knack for building classroom perception demonstrations...
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 15/03/2025
In preparation for my Perception class this next week, on lightness and colour constancy, I made a cardboard model of the 1977 Gilchrist's experiment. Left - the opened box, with equal illumination Right - view through the pinhole (the white target now seems black) #VisionScience
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megan peters 🧠 @meganakpeters.bsky.social · 01/03/2025
me too.
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Cody @codyjohnston.bsky.social · 20/02/2025
Here's our new episode about nonpartisan harm, from @moviehooligan.bsky.social. youtu.be/XCJIaxY46zo?...
youtu.be
Dear Donald Trump Voters: His Actions Are Going To Hurt You Too - SOME MORE NEWS
YouTube video by Some More News
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Zez Vaz @zezvaz.bsky.social · 14/02/2025
‘Cybertruck Man’ a cartoon in defiance of Musk #political #cartoonist #cybertruck #elon #musk #democracy #tiananmen
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Ashley Kuckelman @ashleyvotesblue.bsky.social · 04/02/2025
Trump’s a great deal-maker. 😭☠️😭
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Andy Scollick @andyscollick.bsky.social · 04/02/2025
This should alarm everyone, not just scientists. The U.S. National Science Foundation (NSF), "an independent federal agency that supports science and engineering in all 50 states and U.S. territories", is collaborating with the subversion of American freedom and overthrow of democracy.
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Icelandic Vision Lab @icevislab.bsky.social · 23/01/2025
The U.S. anti-science movement is going forward full force. Withdrawal from the Paris Agreement, an anti-vaxxer as Secretary of Health, and now this?
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 21/01/2025
Here's some old news, for those who are surprised with that gesture
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 16/01/2025
Based on my previous papers, the word 'the' is ~7% of my manuscripts; the word 'of' ~5% and the word 'and' ~4%. The words 'in', 'to', 'for' and 'with' add up to ~8%. Thus, 24% of my next manuscript is already written, without even opening the text editor! What a productive morning! 😅
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 15/01/2025
On the delicate balance between professor and gamer...
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 09/01/2025
Not mine. Just trying to give more visibility to this new paper published by my friends and colleagues ;) www.tandfonline.com/eprint/3V8RM...
tandfonline.com
The contamination effect on recognition memory: adding evidence of an adaptive mnemonic tuning
Previous research has revealed enhanced free recall for neutral items previously associated with disease-causing agents, compared to when they are associated with neutral information; this has been...
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Cody @codyjohnston.bsky.social · 08/01/2025
Here's our new episode about the many, many terrible aspects of AI "art". youtu.be/UoquS5uXOKs?...
youtu.be
Why Does "AI" "Art" Suck So Much? - SOME MORE NEWS
YouTube video by Some More News
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 03/01/2025
I'm having a bad case of hindsight bias! A few years ago, I noticed dark spots on the iris of my cat (Ludovico). Two different vets assured me that it was just innocuous pigmentation. Fast forward to today: the poor cat is being subjected to an enucleation with a likely diagnosis of iris melanoma...
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 29/12/2024
I just wrote my own AI in Python - it 'knows' nothing, but at least it is honest about it, unlike most AIs out there!
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 21/12/2024
For more than 5 years now, I've been (worryingly) fascinated with flat-earthers. As an experimentalist, I am particularly annoyed by how easily they call an "experiment" literally anything other than watching YT videos: Took a picture of a beach? 'Experiment'! Put a level on the floor? 'Experiment'!
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 14/12/2024
So I just saw 'The Apprentice" (2024). There is much to comment (and commend) about the movie, but somehow I was fixed on the odd aspect ratio. I understand it intends to emulate the TV aesthetics of the late 1980s, but I wonder up what degree it also reflects the limited worldview of the character.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 12/12/2024
Dear #VisionScience community: While preparing a diagram, I noticed that straight lines seemed somewhat "wavy" when flanked by dashed lines. For fun, I embedded those lines in a guitar drawing (attached). The effect is subtle and more noticeable when the image is bigger (in a computer monitor). /2
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Cody @codyjohnston.bsky.social · 11/12/2024
Episode! New! New episode!
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Sean Morrow @snmrrw.bsky.social · 10/12/2024
Now that there’s been an arrest I feel safe sharing this story: TMZ reached out to my job asking if I worked there. I called them up to see what they wanted. They claimed to have multiple sources saying I was the killer, then expressed shock that the NYPD hadn’t contacted me yet. Call audio:
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BWJones @bwjones.bsky.social · 09/12/2024
The idea that we can presuppose where science is going to lead is right out of business. The NIH, XEROX PARC and Bell Labs succeed(ed) because they did not presuppose the “products” or outcomes of the investments in them. They hired the right people and enabled them to be curious and to explore.
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Anthony Barnhart @magictony.bsky.social · 08/12/2024
Yours truly appears in this podcast.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 05/12/2024
Ready to celebrate those who went extinct so that we could evolve. Merry Christmas in advance, fellow primates! :)
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BWJones @bwjones.bsky.social · 05/12/2024
<taps the sign> This chart is a decade old, and that gap between the United States and the rest of the developed world, which has better health outcomes by the way, has gotten larger. We should morally, ethically, and fiscally move to a single payer system. It’s also a national security issue.
A chart showing life expectancy vs heath expenditures for all developed nations. America deviated sharply in the 1980s and is documented as having far more expensive healthcare with poorer health outcomes than the rest of the developed world. The gap between the lines has a cloud labeled profit.
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 04/12/2024
I've been waiting for this video for a month now! youtu.be/Z8R4XeNcHu8?...
youtu.be
Is Everyone Stupid? An Election Investigation – SOME MORE NEWS
YouTube video by Some More News
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 04/12/2024
And this is one of the reasons why I have no need for a smartphone...
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Bluesky @bsky.app · 03/12/2024
Scientists, academics, researchers: We’re excited to share that @altmetric.com is now tracking mentions of your research on Bluesky! 🧪
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 04/12/2024
I am convinced that the term "custom made" is used in papers as code for "low-cost apparatus due to insuficient funding". For example, this is our "custom made" head-and-chin rest, built in my kitchen with spare bits of wood and a slice of a tennis ball for the chin (and yes, it works like a charm).
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Tomer Ullman @tomerullman.bsky.social · 01/12/2024
thinking of calling this "The Illusion Illusion" (more examples below)
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 01/12/2024
I lost count of how many times I had to recommend this book, relevant beyound the covered topics. Case in point, social media needs to understand that metrics are not reversible: engagement metrics might well gauge people's enjoyment, but increasing the former does not reflect on the latter. /2
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Nuno De Sá Teixeira @nunodesateixeira.bsky.social · 28/11/2024
Quite often, in #VisualPerception handbooks, when covering topics in #MotionPerception, it is stated that it is not possible to show animations in a book. As shown in this 1978 fencing manual by Bob Anderson, that is not true. Do you know any #VisionScience book that includes this type of demos?
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Lisa Feldman Barrett @lisafeldmanbarrett.com · 19/11/2024
#Sports and the predicting #brain. theconversation.com/anticipation...
theconversation.com
Anticipation in sports: why do some athletes seem to be one step ahead of their opponents?
Some athletes seem to have an ability to predict what’s going to happen in their sports but anticipation is an attribute anyone can develop.
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