Nuno De Sá Teixeira
@nunodesateixeira.bsky.social
Assistant Professor in Experimental Psychology and Researcher on Psychophysics and Visual Perception.
Avid reader of non-fiction.
Amateur astrophotographer, fencer, and musician.
Avid reader of non-fiction.
Amateur astrophotographer, fencer, and musician.
A new addition to my personal library, thanks to Bluesky's #visionscience community (even if in the sequence of a sad new).
September 17, 2025 at 11:55 AM
A new addition to my personal library, thanks to Bluesky's #visionscience community (even if in the sequence of a sad new).
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!
August 28, 2025 at 2:07 PM
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!
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.
August 26, 2025 at 3:18 PM
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.
It's taking me forever to read this book because my brain insists in emulating Bernie's distinctive voice tone...
July 28, 2025 at 2:59 PM
It's taking me forever to read this book because my brain insists in emulating Bernie's distinctive voice tone...
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)
June 6, 2025 at 11:14 AM
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)
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.
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.
April 13, 2025 at 12:40 PM
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.
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.
When your father is a vision scientist and has a knack for building classroom perception demonstrations...
March 19, 2025 at 1:16 PM
When your father is a vision scientist and has a knack for building classroom perception demonstrations...
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
Left - the opened box, with equal illumination
Right - view through the pinhole (the white target now seems black)
#VisionScience
March 15, 2025 at 4:24 PM
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
Left - the opened box, with equal illumination
Right - view through the pinhole (the white target now seems black)
#VisionScience
Well, at least, exercise wise, Republicans are done for the week. No need for more squats in the next few days. #stateoftheunion
March 5, 2025 at 2:58 AM
Well, at least, exercise wise, Republicans are done for the week. No need for more squats in the next few days. #stateoftheunion
Me: "Enough doom scrolling about USA politics - I'll read a Phillip K. Dick novel instead."
The chosen book and its synopsis:
🤦
The chosen book and its synopsis:
🤦
January 28, 2025 at 6:17 PM
Me: "Enough doom scrolling about USA politics - I'll read a Phillip K. Dick novel instead."
The chosen book and its synopsis:
🤦
The chosen book and its synopsis:
🤦
On the delicate balance between professor and gamer...
January 15, 2025 at 11:57 AM
On the delicate balance between professor and gamer...
I just wrote my own AI in Python - it 'knows' nothing, but at least it is honest about it, unlike most AIs out there!
December 29, 2024 at 1:21 PM
I just wrote my own AI in Python - it 'knows' nothing, but at least it is honest about it, unlike most AIs out there!
The internet is so cyclical - a few years ago this other graph was being widely commented on, for the exact same reasons
December 29, 2024 at 12:27 PM
The internet is so cyclical - a few years ago this other graph was being widely commented on, for the exact same reasons
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
December 12, 2024 at 4:23 PM
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
Ready to celebrate those who went extinct so that we could evolve. Merry Christmas in advance, fellow primates! :)
December 5, 2024 at 10:47 PM
Ready to celebrate those who went extinct so that we could evolve. Merry Christmas in advance, fellow primates! :)
And this is one of the reasons why I have no need for a smartphone...
December 4, 2024 at 9:28 PM
And this is one of the reasons why I have no need for a smartphone...
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).
December 4, 2024 at 10:49 AM
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).
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
December 1, 2024 at 2:23 PM
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
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?
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?
November 28, 2024 at 10:51 PM
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?
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?
While waiting for the perfect combination of clear skies and enough free time to set up my telescopes, here is a photo of the Andromeda Galaxy I took back in 2020 (Say what you want, but Covid confinements were great for hobbies).
November 28, 2024 at 12:18 PM
While waiting for the perfect combination of clear skies and enough free time to set up my telescopes, here is a photo of the Andromeda Galaxy I took back in 2020 (Say what you want, but Covid confinements were great for hobbies).