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Zejin Lu

@zejinlu.bsky.social
126 followers 144 following 31 posts

PhD Student @FU_Berlin co-supervised by Prof. Radoslaw M. Cichy and Prof. Tim Kietzmann, interested in machine learning and cognitive science. Personal webpage: zejinlu.com

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Reposted by Zejin Lu
Victoria Bosch @initself.bsky.social · 28/08/2026
Are brains and artificial neural networks converging onto universal representations? There is a seductive idea making the rounds in NeuroAI / machine learning: train systems well enough, and they all converge on the same representation of reality (i.e. a unique world model). We have thoughts™ 1/n
cell.com
The Umwelt Representation Hypothesis: rethinking Universality
Recent studies reveal striking representational alignment between artificial neural networks (ANNs) and biological brains, leading to proposals that all sufficiently capable systems converge on univer...
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Reposted by Zejin Lu
Ryuto Yashiro @ryuto-yashiro.bsky.social · 11/08/2026
Excited to share our new paper: "Probing the content of semantic representations in body-selective regions" We propose a framework based on object co-occurrence to interpret semantic representations of natural scenes predicted by LLM embeddings. doi.org/10.1162/IMAG...
doi.org
Probing the content of semantic representations in body-selective regions
Abstract. Recent advances in neural networks trained on natural language have revealed that category-selective regions encode complex semantics and contextual information of natural scenes in addition...
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Reposted by Zejin Lu
Philip Sulewski @psulewski.bsky.social · 26/05/2026
Now out in Nature Neuroscience: "Fixation duration on natural scenes is explained by memory encoding not processing demand". www.nature.com/articles/s41... Our eyes don't linger because recognition is hard; they linger to remember. Let me take you on a quick tour. 🧵
nature.com
Fixation duration on natural scenes is explained by memory encoding not processing demand - Nature Neuroscience
By combining magnetoencephalography and eye tracking, this study sheds light on why people fixate on some parts of natural scenes longer than others. Rather than visual complexity, fixation durations ...
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Zejin Lu @zejinlu.bsky.social · 26/05/2026
Happy to share that our Developmental Visual Diet (DVD) paper was selected as the cover article for the May issue of Nature Machine Intelligence ( @natmachintell.nature.com)! www.nature.com/natmachintel...
nature.com
Volume 8 | Nature Machine Intelligence
Browse all the issues in Volume 8 of Nature Machine Intelligence
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
We are incredibly excited about this because DVD may offer a resource-efficient path towards safer, more human-like AI vision — and suggests that biology, neuroscience, and psychology have much to offer in guiding the next generation of artificial intelligence. #NeuroAI @natmachintell.nature.com/fin
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
We’ve also made the code and trained checkpoints public, please check: github.com/KietzmannLab.... 11/
github.com
GitHub - KietzmannLab/DVD: Developmental Visual Diet
Developmental Visual Diet. Contribute to KietzmannLab/DVD development by creating an account on GitHub.
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
In summary, DVD-training yields models that rely on a fundamentally different feature set, shifting from distributed local textures to integrative, shape-based features as the foundation for their decisions. 10/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Result 5: In contrast to the previous literature’s main focus on visual acuity, we found that the development of contrast sensitivity is a key driver of shape bias in our models. 9/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Result 4: How about adversarial robustness? DVD-trained models also showed greater resilience to all black- and white-box attacks tested, performing 3–5 times better than baselines under high-strength perturbations. 8/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Result 3: DVD-trained models exhibit more human-like robustness to Gaussian blur compared to baselines, plus an overall improved robustness to all image perturbations tested. 7/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Result 2: DVD-training enabled abstract shape recognition in cases where large vision-language models, despite being explicitly prompted, fail spectacularly. t-SNE nicely visualises the fundamentally different approach of DVD-trained models. 6/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Feature attribution using Grad-CAM revealed that DVD-training resulted in a different recognition strategy than baseline controls: DVD-training puts emphasis on large parts of the objects, rather than highly localised or highly distributed features. 5/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Result 1: DVD training massively improves shape-reliance in ANNs. We report a new state of the art, reaching human-level shape-bias (even though the model uses orders of magnitude less data and parameters). This was true for all datasets and architectures tested 4/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
We then test the resulting DNNs across a range of conditions, each selected because they are challenging to AI: (i) shape-texture bias, (ii) adversarial robustness, (iii) robustness to image perturbations, and (iv) recognising abstract shapes embedded in complex backgrounds. 3/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
The idea: instead of high-fidelity training from the get-go (the gold standard), we simulate the visual development from newborns to 25 years of age by synthesising decades of developmental vision research into an AI preprocessing pipeline (Developmental Visual Diet - DVD) 2/
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Now out in Nature Machine Intelligence @NatMachIntell “Adopting a human developmental visual diet yields robust and shape-based AI vision”: doi.org/10.1038/s422.... A wonderful case where brain inspiration improved AI. With @martisamuser.bsky.social, Radek Cichy and @timkietzmann.bsky.social .
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Reposted by Zejin Lu
Daniel Anthes @anthesdaniel.bsky.social · 11/05/2026
Excited about our new preprint: “The illusory simplicity of the feedforward pass: evidence for the dynamical nature of stimulus encoding along the primate ventral stream” arxiv.org/abs/2604.12825 Work with Sushrut Thorat, Anna Mitola, Paolo Papale, Peter König & Tim Kietzmann 🧵 thread below
arxiv.org
The illusory simplicity of the feedforward pass: evidence for the dynamical nature of stimulus encoding along the primate ventral stream
In studying primate vision, a large body of work focuses on the first feedforward sweep. During this initial time window, information is thought to pass through ventral stream regions in a stage-like ...
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Reposted by Zejin Lu
Sushrut Thorat @martisamuser.bsky.social · 18/11/2025
🚨New Preprint! How can we model natural scene representations in visual cortex? A solution is in active vision: predict the features of the next glimpse! arxiv.org/abs/2511.12715 + @adriendoerig.bsky.social , @alexanderkroner.bsky.social , @carmenamme.bsky.social , @timkietzmann.bsky.social 🧵 1/14
arxiv.org
Predicting upcoming visual features during eye movements yields scene representations aligned with human visual cortex
Scenes are complex, yet structured collections of parts, including objects and surfaces, that exhibit spatial and semantic relations to one another. An effective visual system therefore needs unified ...
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Reposted by Zejin Lu
Victoria Bosch @initself.bsky.social · 03/11/2025
Introducing CorText: a framework that fuses brain data directly into a large language model, allowing for interactive neural readout using natural language. tl;dr: you can now chat with a brain scan 🧠💬 1/n
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Zejin Lu @zejinlu.bsky.social · 10/08/2025
If you are interested in development and development-inspired NeuroAI, and are coming to CCN this year, come join the workshop with us on 1️⃣1️⃣ Monday, Aug 11 🕒 3:00 – 6:00 pm 📍 Room A2.11 Register here: sites.google.com/view/child2m... (You can also come by my poster to chat!)
sites.google.com
CCN 2025 Satellite Event
Background The human visual system is full of optimisations—mechanisms designed to extract the most useful information from a constant stream of incoming data. The field of neuro-AI has made significa...
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Reposted by Zejin Lu
Rhodri Cusack @rhodricusack.bsky.social · 25/06/2025
Not just one, but two fantastic chances to discuss how infant development can inform machine learning and vice-versa at CCN 2025 in Amsterdam!!! Satellite workshop sites.google.com/view/child2m... and Generative Adversarial Collaboration sites.google.com/ccneuro.org/...
sites.google.com
CCN 2025 Satellite Event
Background The human visual system is full of optimisations—mechanisms designed to extract the most useful information from a constant stream of incoming data. The field of neuro-AI has made significa...
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Reposted by Zejin Lu
Adrien Doerig @adriendoerig.bsky.social · 07/08/2025
🚨 Finally out in Nature Machine Intelligence!! "Visual representations in the human brain are aligned with large language models" 🔗 www.nature.com/articles/s42...
nature.com
High-level visual representations in the human brain are aligned with large language models - Nature Machine Intelligence
Doerig, Kietzmann and colleagues show that the brain’s response to visual scenes can be modelled using language-based AI representations. By linking brain activity to caption-based embeddings from lar...
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Zejin Lu @zejinlu.bsky.social · 10/07/2025
Hi Lukas, very interesting work! Is it possible to know the shape bias in the Geirhos way? He reports the average shape bias across categories (see his plot code here: github.com/bethgelab/mo...). It would be even better if we could also know the average shape bias of each model across seeds:)!
github.com
model-vs-human/modelvshuman/plotting/plot.py at master · bethgelab/model-vs-human
Benchmark your model on out-of-distribution datasets with carefully collected human comparison data (NeurIPS 2021 Oral) - bethgelab/model-vs-human
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Zejin Lu @zejinlu.bsky.social · 08/07/2025
🚨 Preprint alert! Excited to share my second PhD project: “Adopting a human developmental visual diet yields robust, shape-based AI vision” -- a nice case showing that biology, neuroscience, and psychology can still help AI :)! arxiv.org/abs/2507.03168
arxiv.org
Adopting a human developmental visual diet yields robust, shape-based AI vision
Despite years of research and the dramatic scaling of artificial intelligence (AI) systems, a striking misalignment between artificial and human vision persists. Contrary to humans, AI heavily relies ...
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
If the above link doesn’t work for you, please try this one: www.nature.com/articles/s41...
nature.com
End-to-end topographic networks as models of cortical map formation and human visual behaviour - Nature Human Behaviour
Lu et al. introduce all-topographic neural networks as a parsimonious model of the human visual cortex.
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
In conclusion, All-TNNs are an exciting new class of networks for modelling primate vision, which address questions that are beyond the scope of CNNs and their topographic derivatives. 12/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Next, we will use All-TNNs to explore the various factors of how smooth maps emerge from model training, without the need for a secondary smoothness loss. Possible avenues include wiring length optimization, energy constraints, local inhibition, or top-down connectivity patterns. 11/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Can TNNs expand to self-supervised objectives? Yes, to a degree. We show that training All-TNNs with SimCLR yields smooth topography and category-independent spatial biases. However, SimCLR training fails to reproduce the structure of human-like category-specific spatial biases. 10/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
We show that these behavioural accuracy maps are structured and exhibit category-specific effects. Importantly, All-TNNs better reproduce these spatial structures of human visual biases than CNNs and other control models. 9/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
To study the impact of topography on behaviour, we conducted a human psychophysical experiment to quantify object recognition performance across spatial locations. This provided us with category-specific spatial accuracy maps for humans. 8/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Similarly, All-TNNs allocate energy expenditure to task-relevant input regions, using an order of magnitude less “metabolic” cost than CNNs! And the smoother the topography, the greater the energy efficiency of the network! Energy efficiency was not explicitly optimised for. 7/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Interestingly, All-TNNs exhibit a form of foveation, and allocate more processing resources to spatial regions rich in task-relevant information. 6/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Upon training, topographical features reminiscent of the ventral stream emerge in All-TNNs, including smooth orientation selectivity maps in the first layer, and category-based selectivity clusters for tools, scenes, and faces in the last layer. 6/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
All-TNNs overcome this limitation. In All-TNNs 1) each unit has its own local RF, 2) units in each layer are arranged on a 2D “cortical sheet” without weight sharing, and 3) feature selectivity varies smoothly across space by encouraging similar selectivity in neighboring units. 5/12
Overall network architecture of All-TNNs
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Yet, their reliance on weight sharing, i.e., detecting identical features across visual space, renders them unable to model central aspects of biological vision, such as the origin of topography and its relation to behaviour. 4/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Background: CNNs are commonly used to model primate vision, and have been successful at predicting neural activity and at accounting for complex visual behaviour. 3/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
With Adrien Doerig(@adriendoerig.bsky.social) , Victoria Bosch (@initself.bsky.social), Daniel Kaiser (@dkaiserlab.bsky.social), Radoslaw Martin Cichy and Tim C Kietzmann (@timkietzmann.bsky.social). 2/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
In this work, we introduce All-Topographic Neural Networks (All-TNNs)—ANNs that drop weight sharing and learn on a smooth “cortical sheet,” capturing both human-like neural topography and visual biases in behaviour. 2/12
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Zejin Lu @zejinlu.bsky.social · 06/06/2025
Now out in Nature Human Behaviour @nathumbehav.nature.com : “End-to-end topographic networks as models of cortical map formation and human visual behaviour”. Please check our NHB link: www.nature.com/articles/s41...
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