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arxiv: 2604.03619 · v1 · submitted 2026-04-04 · 💻 cs.CV

Recognition: no theorem link

Can Natural Image Autoencoders Compactly Tokenize fMRI Volumes for Long-Range Dynamics Modeling?

Authors on Pith no claims yet

Pith reviewed 2026-05-13 18:07 UTC · model grok-4.3

classification 💻 cs.CV
keywords fMRIautoencodertransformertokenizationbrain dynamicsspatiotemporal modelingself-supervised learning
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The pith

A 2D natural-image autoencoder can compress 3D fMRI volumes into compact tokens that let a Transformer capture long-range brain dynamics with far less memory.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper asks whether an autoencoder trained on ordinary photos can turn high-dimensional 3D fMRI brain volumes into a small number of continuous tokens. If the tokens retain the necessary spatiotemporal structure, a standard Transformer encoder can then model much longer sequences of brain activity than voxel-based methods allow. The authors implement this idea in TABLeT and report higher accuracy than prior models on classification and prediction tasks across the UK Biobank, Human Connectome Project, and ADHD-200 datasets. They further show that the approach uses substantially less VRAM and compute than the leading voxel-based baseline when given identical inputs. A self-supervised masked-token pretraining stage is added to improve results on downstream tasks.

Core claim

TABLeT compresses each 3D fMRI volume with a frozen 2D natural-image autoencoder into a compact set of continuous tokens; a Transformer encoder then processes long token sequences for brain-dynamics tasks, outperforming voxel-based models in accuracy while using far less memory on UKB, HCP, and ADHD-200 benchmarks.

What carries the argument

Tokenization of 3D fMRI volumes by a pre-trained 2D natural-image autoencoder that produces a compact sequence of continuous tokens for input to a Transformer encoder.

Load-bearing premise

That a 2D autoencoder trained only on everyday photos can compress 3D fMRI volumes without discarding the spatiotemporal details required for accurate long-range dynamics modeling.

What would settle it

Train the same Transformer on identical long fMRI sequences once with raw voxels and once with the autoencoded tokens, then check whether task accuracy drops sharply with the tokens.

Figures

Figures reproduced from arXiv: 2604.03619 by Jiook Cha, Jubin Choi, Juhyeon Park, Jungwoo Park, Jungwoo Seo, Peter Yongho Kim, Taesup Moon.

Figure 1
Figure 1. Figure 1: We show that a 2D natural image autoencoder can be [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: In TABLeT, each frame of the fMRI timeseries is tokenized by a 2D autoencoder, and the tokens are processed by a Transformer. [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Visualization of reconstructions from 3D and 2D DCAE. [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Information preservation of 3D and 2D DCAE. [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Comparison of (a) memory and (b) training time, between TABLeT and SwiFT. [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Performance of TABLeT on HCP-Intelligence and [PITH_FULL_IMAGE:figures/full_fig_p007_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: IG map [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Validation Loss Curve for Training of 3D DCAE. [PITH_FULL_IMAGE:figures/full_fig_p012_8.png] view at source ↗
read the original abstract

Modeling long-range spatiotemporal dynamics in functional Magnetic Resonance Imaging (fMRI) remains a key challenge due to the high dimensionality of the four-dimensional signals. Prior voxel-based models, although demonstrating excellent performance and interpretation capabilities, are constrained by prohibitive memory demands and thus can only capture limited temporal windows. To address this, we propose TABLeT (Two-dimensionally Autoencoded Brain Latent Transformer), a novel approach that tokenizes fMRI volumes using a pre-trained 2D natural image autoencoder. Each 3D fMRI volume is compressed into a compact set of continuous tokens, enabling long-sequence modeling with a simple Transformer encoder with limited VRAM. Across large-scale benchmarks including the UK-Biobank (UKB), Human Connectome Project (HCP), and ADHD-200 datasets, TABLeT outperforms existing models in multiple tasks, while demonstrating substantial gains in computational and memory efficiency over the state-of-the-art voxel-based method given the same input. Furthermore, we develop a self-supervised masked token modeling approach to pre-train TABLeT, which improves the model's performance for various downstream tasks. Our findings suggest a promising approach for scalable and interpretable spatiotemporal modeling of brain activity. Our code is available at https://github.com/beotborry/TABLeT.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The paper proposes TABLeT, which tokenizes 3D fMRI volumes via a pre-trained 2D natural-image autoencoder into compact continuous tokens, enabling long-range spatiotemporal modeling with a standard Transformer encoder under limited memory. It reports outperformance over prior voxel-based models on UK-Biobank, HCP, and ADHD-200 benchmarks across multiple tasks, substantial efficiency gains, and further improvements from self-supervised masked token pre-training.

Significance. If the central claims hold, the work could enable scalable long-sequence fMRI modeling by sidestepping the memory limits of voxel-based approaches, opening the door to longer temporal windows and cross-domain transfer from natural-image pre-training. The efficiency and pre-training contributions would be practically useful for neuroimaging pipelines.

major comments (2)
  1. [§3] §3 (Methods, tokenization procedure): the claim that 2D natural-image AE tokens retain the spatiotemporal information needed for long-range dynamics modeling is load-bearing, yet the description does not specify how anisotropic resolution, inter-slice coherence, or brain-specific correlations are preserved when a 3D volume is fed to a 2D AE. If processing is effectively slice-wise, the mapping risks discarding depth structure, which would invalidate the reported gains over voxel baselines.
  2. [§5] §5 (Experiments and results): the abstract asserts outperformance and efficiency gains, but the provided text supplies no quantitative metrics, ablation tables, baseline details, error bars, or statistical tests. Without these, it is impossible to verify whether the efficiency/accuracy claims are supported or whether they survive controls for the 2D-to-3D mapping.
minor comments (1)
  1. The GitHub link for code is welcome; the repository should include exact preprocessing scripts, hyper-parameter settings, and the precise 2D AE checkpoint used so that the tokenization step can be reproduced.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback. The comments highlight important areas for clarification in the tokenization procedure and experimental reporting. We address each major comment below and will revise the manuscript accordingly.

read point-by-point responses
  1. Referee: [§3] §3 (Methods, tokenization procedure): the claim that 2D natural-image AE tokens retain the spatiotemporal information needed for long-range dynamics modeling is load-bearing, yet the description does not specify how anisotropic resolution, inter-slice coherence, or brain-specific correlations are preserved when a 3D volume is fed to a 2D AE. If processing is effectively slice-wise, the mapping risks discarding depth structure, which would invalidate the reported gains over voxel baselines.

    Authors: We thank the referee for this important observation. In TABLeT, each 3D fMRI volume is tokenized by applying the pre-trained 2D natural-image autoencoder independently to each axial slice. This slice-wise application is intentional to leverage the compact, semantically rich latent space of the 2D AE, which has been shown to generalize to medical images. Spatiotemporal information is preserved because: (1) the AE encodes local spatial structure within each slice, (2) the Transformer encoder then models long-range temporal dependencies across the sequence of tokenized volumes, and (3) inter-slice coherence emerges from the consistent feature extraction across adjacent slices combined with the transformer's global attention. We handle anisotropic resolution via standard resampling to isotropic spacing prior to tokenization. While we acknowledge that a purely slice-wise approach could theoretically lose some volumetric context, our experiments demonstrate that the resulting tokens retain sufficient information to outperform voxel-based baselines on multiple benchmarks. We will expand §3 with a detailed diagram of the tokenization pipeline, explicit discussion of these preservation mechanisms, and an additional ablation comparing slice-wise vs. 3D-aware variants. revision: partial

  2. Referee: [§5] §5 (Experiments and results): the abstract asserts outperformance and efficiency gains, but the provided text supplies no quantitative metrics, ablation tables, baseline details, error bars, or statistical tests. Without these, it is impossible to verify whether the efficiency/accuracy claims are supported or whether they survive controls for the 2D-to-3D mapping.

    Authors: We apologize if the quantitative results were not immediately visible in the version reviewed. The full manuscript in §5 contains multiple tables and figures reporting: (i) task performance (accuracy, AUC, etc.) on UKB, HCP, and ADHD-200 with direct comparisons to voxel-based baselines, (ii) memory and compute efficiency metrics showing substantial VRAM reductions, (iii) ablation studies on tokenization, masked pre-training, and the 2D-to-3D mapping, (iv) error bars from 5-fold cross-validation or repeated runs, and (v) statistical significance via paired t-tests with p-values. These results support the claims of outperformance and efficiency while controlling for the tokenization approach. We will revise §5 to add explicit in-text references to all tables/figures, include a consolidated summary table of key metrics, and ensure all controls for the 2D mapping are highlighted. revision: yes

Circularity Check

0 steps flagged

No significant circularity; claims rely on external pre-trained models and benchmark evaluation

full rationale

The paper describes TABLeT as tokenizing 3D fMRI volumes via a pre-trained 2D natural-image autoencoder, followed by a standard Transformer encoder and self-supervised masked token modeling. No equations, derivations, or fitted parameters are shown that reduce the reported performance gains (on UKB, HCP, ADHD-200) to quantities defined by construction from the same inputs. The approach depends on external pre-trained components and independent downstream benchmarks, so the central claims remain self-contained without self-definitional or fitted-input reductions.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the untested transferability of a 2D natural-image autoencoder to fMRI volumes and on the assumption that the resulting tokens preserve dynamics information.

axioms (1)
  • domain assumption A 2D autoencoder trained on natural images can be applied slice-wise to 3D fMRI volumes to produce useful continuous tokens
    Invoked in the description of the tokenization step; no justification or ablation is given in the abstract.

pith-pipeline@v0.9.0 · 5552 in / 1283 out tokens · 60675 ms · 2026-05-13T18:07:55.168537+00:00 · methodology

discussion (0)

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