REVIEW 3 major objections 5 minor 7 cited by
This paper aims to establish that EEG foundation models, despite rapid progress, have not yet achieved universally transferable representations: across a 13-dataset benchmark, specialist models trained from scratch remain highly competitive
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
T0 review · deepseek-v4-flash
2026-08-04 06:14 UTC pith:IB2KSPA7
load-bearing objection A genuinely useful EEG foundation-model benchmark and survey, but the 'bigger is not better' conclusion is a confounded cross-model observation, not a scaling-law test. the 3 major comments →
EEG-FM-Compass: Progress, Benchmarking, and Future Directions for EEG Foundation Models
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The paper's central claim is that current EEG foundation models do not yet justify the foundation-model premise: they rarely outperform small specialist models trained from scratch, and they cannot be used as frozen feature extractors. The aggregate ranking places CBraMod (4.0M parameters) first and EEGNet (2K parameters) second, with four of the top five models being specialists. The authors interpret this as evidence that masked-reconstruction pre-training on current EEG corpora does not yet produce representations that transfer universally across BCI paradigms.
What carries the argument
The load-bearing mechanism is the benchmark itself: a standardized evaluation protocol applying leave-one-subject-out and within-subject few-shot scenarios, full-parameter fine-tuning and linear probing, across 13 public datasets spanning nine BCI paradigms. Aggregate ranking tables (Table VII and Fig. 8) and top-1/top-3 counts across tasks are the instruments that produce the central conclusion. The paper also contributes a taxonomy of pre-training objectives (masked raw-signal, token, frequency-domain, codebook, autoregressive) used to organize the 50 surveyed models.
Load-bearing premise
The scale conclusion assumes the cross-model comparison isolates model size, but the 12 foundation models differ simultaneously in pre-training data, architecture, objective, compute, and release date; the paper's own survey notes that capacity and resources vary non-monotonically (Section II-A).
What would settle it
Re-run the benchmark after removing all entries marked '*' (models pre-trained on the same downstream datasets) and check whether specialist models still outrank foundation models; alternatively, train the same architecture and pre-training objective with increasing data volumes and parameter counts under matched compute, and test whether downstream performance improves monotonically – if it does, the 'scale does not help' claim is overturned.
If this is right
- If foundation models require full-parameter fine-tuning anyway, their advantage over from-scratch specialists narrows to initialization, which current results suggest is often negative.
- Benchmarking practice should adopt the two-scenario protocol (LOSO plus few-shot calibration) as a standard, since LOSO alone overstates deployment readiness.
- Research priority should shift from scaling parameters and data toward pre-training objectives and data curation; the paper explicitly points to data quality as a likely limiting factor.
- Paradigm-specific foundation models (e.g., MIRepNet for motor imagery) may offer a more practical route than universal models, because the target paradigm is usually known before deployment.
Where Pith is reading between the lines
- The 'larger is not better' conclusion is an observation about confounded comparisons, not a tested scaling law; a controlled study varying only model size while holding data, objective, and compute fixed would be needed to settle whether EEG exhibits scaling behavior.
- The benchmark includes models pre-trained on the same downstream datasets (marked with '*' in the tables), which may inflate those models' scores; a re-ranking that excludes such entries would test how much of the specialist advantage is due to data overlap.
- If the findings generalize, the BCI community may converge on compact, paradigm-tuned architectures rather than billion-parameter EEG transformers, lowering compute barriers for real-world deployment.
- The few-shot analysis suggests relative model rankings are largely stable across calibration data volumes, implying that model selection could be performed with small calibration sets before committing to full fine-tuning.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents EEG-FM-Compass, a survey and benchmark for EEG foundation models (FMs). It reviews roughly 50 recent models and organizes them into a taxonomy spanning preprocessing, architecture, and self-supervised objectives. It then evaluates 12 open-source FMs and 7 specialist baselines on 13 EEG datasets covering 9 BCI paradigms under two adaptation scenarios: leave-one-subject-out (LOSO) and within-subject few-shot. In each scenario it compares full-parameter fine-tuning against linear probing, examines fine-tuning data ratios, and analyzes model-scale effects. The three headline conclusions are: (1) linear probing is frequently insufficient relative to full fine-tuning; (2) specialist models trained from scratch remain highly competitive; and (3) larger FMs do not necessarily generalize better.
Significance. If the results are taken with appropriate caveats, this is a valuable resource for the EEG-FM community. The survey component is broad and the unified taxonomy is useful. The benchmark is unusually comprehensive in dataset coverage (13 datasets, 9 paradigms) and includes two deployment-oriented protocols, per-subject results, and mean/std over three seeds. The comparison of linear probing versus full fine-tuning is a useful empirical data point, and the finding that lightweight specialists such as EEGNet remain competitive is a meaningful caution for the field. The main weakness is that the scaling-law conclusion is over-interpreted from a confounded cross-model comparison, and the benchmark rankings are not adjusted for pre-training/downstream dataset overlap. These issues are fixable by reframing or additional analysis.
major comments (3)
- [Section III-D3, Table VII, Fig. 8, Section V] The central claim that 'increasing model size alone does not guarantee improved generalization' is presented as a tested scaling-law result, but the evidence is a cross-model rank comparison. The 12 FMs and 7 specialists differ simultaneously in parameter count, pre-training corpus (e.g., 1.5 TB vs 27,062 h vs 357,000 h), pre-training objective (masked raw reconstruction, codebook, contrastive, autoregressive), backbone (Transformer/Mamba/CNN), fine-tuning protocol, and release date. Section II-A itself notes that 'model capacity and training resources ... exhibit substantial variability rather than a monotonic scaling trend.' Table VII and Fig. 8 can support a descriptive observation about currently released checkpoints, not a causal claim about model size per se. This is load-bearing because Q3 and Section IV-C1 use the absence of scaling to motivate large-scale data construction. Plea
- [Section III-D, Tables V-VI] Several starred entries indicate that the pre-training corpus of a model overlaps with the downstream evaluation dataset or its parent dataset. For example, BENDR, CBraMod, EEGMamba, and LUNA are pre-trained on TUEG and evaluated on TUAB; BIOT-6D and TFM are pre-trained on CHB-MIT and evaluated on CHB-MIT; LaBraM and EEGPT are pre-trained on SEED and evaluated on SEED. The aggregate rankings in Table VII and Fig. 7 include these overlapping results without adjustment, so the 'transfer' score conflates generalization with near-distribution or in-distribution evaluation. This can bias the FM-versus-specialist comparison and the overall model rankings. Please either exclude overlapping (model, dataset) pairs from aggregate ranks, report them in a separate column, or conduct a sensitivity analysis restricted to non-overlapping tasks.
- [Table VII] The 'average rank' in Table VII is computed over models that are not evaluated on identical datasets: BrainOmni-Tiny/Base have '—' entries for CHB-MIT (Table V) and Sleep-EDFx (Table VI), and other missing entries exist. If ranks are averaged only over available datasets, models evaluated on a smaller or easier subset can obtain an advantage. The paper should state clearly whether each average is over the common set of tasks/scenarios or over the available entries per model. If the latter, the comparability of Table VII is compromised. Since this table is direct evidence for the top-level ranking and the scale conclusion, this issue should be corrected or the missing entries handled explicitly.
minor comments (5)
- [Abstract vs Introduction] The abstract says '55 representative models' while the introduction and Section II say '50 models'. Please reconcile the count.
- [Figure 3] The axis labels and legend entries in Figure 3 appear garbled (e.g., '/uni00000019/...' sequences). The figure is effectively unreadable in the submitted version and needs to be regenerated.
- [Table II] The 'Overlap' column uses symbols such as '%', '!', and '\%' without a legend. Please define these markers in the table caption or main text.
- [Section III-C, Appendix C] MIRepNet is listed among the evaluated foundation models in Section III-C, but it does not appear in the main Tables V-VI; it appears only in the appendix on MI datasets. This should be stated explicitly in the main text to avoid confusion about the 12-model benchmark.
- [References] Reference [33] is titled 'EEGPT: Unleashing the potential of EEG generalist foundation model by autoregressive pre-training' but the corresponding row in Table I is labeled 'BrainGPT'. Please correct the citation/title mismatch.
Circularity Check
No significant circularity: benchmark conclusions are empirical; self-citations are minor and not load-bearing.
full rationale
EEG-FM-Compass is a benchmark and survey rather than a derivation, so the main circularity patterns do not apply. The headline results — linear probing is frequently insufficient, specialist models remain competitive, and larger FMs do not necessarily generalize better — are obtained by fine-tuning released checkpoints and baselines on fixed LOSO and within-subject few-shot protocols, then reading accuracies and ranks from Tables V–VII and Figs. 7–8. No parameter is fitted to the benchmark and then reported as a prediction; the rankings are direct empirical measurements. The scaling claim is admittedly descriptive: Section II-A itself states that 'model capacity and training resources ... exhibit substantial variability rather than a monotonic scaling trend,' and the cross-model comparison is confounded by differing pre-training data, objectives, backbones, compute, and release dates. That confound is a validity caveat, not a circular reduction, because the paper does not claim to have isolated model size by construction. The paper does contain minor self-citations: MIRepNet [49] is the authors' own paradigm-specific model and is highlighted in Section IV-A and the appendix, while CLEAN-MI [71] and EA references [72]–[73] involve the same group. However, MIRepNet is not in the main Table VII overall ranking or in the specialist-vs-FM top-1/top-3 aggregates that drive the central conclusions; it appears only in the MI appendix and discussion. CLEAN-MI is cited only to motivate future data-quality research. Thus the self-citations are not load-bearing, and there is no equation-level or construction-level circularity. Score 2 reflects these minor, non-load-bearing self-references rather than any substantive circularity.
Axiom & Free-Parameter Ledger
axioms (3)
- domain assumption The benchmark protocols (LOSO and within-subject few-shot) are representative of real-world BCI deployment and are fair to both foundation and specialist models.
- domain assumption Publicly released checkpoints and default fine-tuning procedures provide a fair comparison of the model families.
- domain assumption Including evaluation datasets that overlap with pre-training (marked '*') does not materially distort the aggregate rankings.
read the original abstract
Electroencephalography (EEG) foundation models (FMs) have recently emerged as a promising paradigm for brain-computer interfaces, aiming to learn transferable neural representations from large-scale heterogeneous recordings. Despite rapid progress, a fair and comprehensive comparison of existing EEG FMs is still lacking, owing to inconsistent pre-training objectives, preprocessing choices, and downstream evaluation protocols. To fill this gap, we present EEG-FM-Compass. We first review 55 representative models and organize their design choices into a unified taxonomic framework including data standardization, model architectures, and self-supervised pre-training strategies. We then evaluate 12 open source FMs and competitive specialist baselines across 13 EEG datasets spanning nine brain-computer interface paradigms. Emphasizing real-world deployments, we consider both cross-subject generalization under a leave-one-subject-out protocol and rapid calibration under a within-subject few-shot setting. We further compare full-parameter fine-tuning with linear probing to assess the transferability of pre-trained representations, and examine the relationship between model scale and downstream performance. Our results indicate that: 1) linear probing is frequently insufficient; 2) specialist models trained from scratch remain competitive across many tasks; and 3) larger FMs do not necessarily yield better generalization performance under current data regimes and training practices.
Figures
Forward citations
Cited by 7 Pith papers
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EEG-FM-Audit: A Systematic Evaluation and Analysis Pipeline for EEG Foundation Models
EEG-FM-Audit is an evaluation pipeline showing that properly tuned supervised baselines can match or outperform EEG foundation models with far fewer parameters on public datasets.
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Aperiodic and Low-Frequency Spectral Bias in Reconstruction based EEG Foundation Models
Reconstruction-based EEG foundation models preferentially encode aperiodic and low-frequency components over oscillatory structure, with embeddings capturing subject identity more than task-relevant information.
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NeuroAtlas: Benchmarking Foundation Models for Clinical EEG and Brain-Computer Interfaces
NeuroAtlas benchmarks foundation models on 42 EEG datasets and reports that EEG-specific models do not consistently outperform generic time-series models, standard metrics miss clinical utility, and rankings vary by domain.
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NeuralBench: A Unifying Framework to Benchmark NeuroAI Models
NeuralBench is a new benchmarking framework for neuroAI models on EEG data that finds foundation models only marginally outperform task-specific ones while many tasks like cognitive decoding stay highly challenging.
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Foundation Model Guided Dual-Branch Co-Adaptation for Source-Free EEG Decoding
FUSED integrates EEG foundation models into source-free domain adaptation via dual-branch co-adaptation, consensus filtering, and two-stage pseudo-label refinement to achieve state-of-the-art cross-subject EEG decoding.
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Dive into Waves: Morlet Spectral Transformer for Cross-Subject Emotion Decoding from EEG
MST combines Morlet wavelet tokenization, long-context baseline removal, and frequency-specific spatial projections with a Transformer backbone to outperform pretrained EEG models on SEED datasets for cross-subject em...
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From Clever Hans to Scientific Discovery: Interpreting EEG Foundational Transformers with LRP
LRP on EEG transformers reveals Clever Hans artifacts in motor imagery tasks and a recurring central electrode cluster as a candidate sensorimotor signature of arousal.
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