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Paper · 2505.14556 · 2025

Dynadiff: Single-stage Decoding of Images from Continuously Evolving fMRI

arXiv · PDF · Open in the Atlas

Code that ran

We lifted 5 functions out of this paper's own repositories and ran 4 of them in a sandbox. "Ran" means the function executed on a synthesized input and returned a value. It is not a reproduction of the paper's results.

RepositoryRoleRan
facebookresearch/dynadiff canonical 4 of 5
FunctionStatusWhere it lives
batch_intersection_union Ran facebookresearch/dynadiff/metrics/mIOU/eval_miou.py
pointer only (licence: MIT) · get_code("d09bf6c7c12f65f3")
batch_pix_accuracy Ran facebookresearch/dynadiff/metrics/mIOU/eval_miou.py
pointer only (licence: MIT) · get_code("f1fb897b7787acfa")
get_mask Ran facebookresearch/dynadiff/blur.py
pointer only (licence: MIT) · get_code("bd3ca5bbe94ef235")
intersectionAndUnion Ran facebookresearch/dynadiff/metrics/mIOU/eval_miou.py
pointer only (licence: MIT) · get_code("de2ee01cea02bf0f")
compute_miou Not yet run facebookresearch/dynadiff/metrics/mIOU/evaluate_img_gen.py
pointer only (licence: MIT) · get_code("02015a2dbd02c1de")

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Abstract

Brain-to-image decoding has been recently propelled by the progress in generative AI models and the availability of large ultra-high field functional Magnetic Resonance Imaging (fMRI). However, current approaches depend on complicated multi-stage pipelines and preprocessing steps that typically collapse the temporal dimension of brain recordings, thereby limiting time-resolved brain decoders. Here, we introduce Dynadiff (Dynamic Neural Activity Diffusion for Image Reconstruction), a new single-stage diffusion model designed for reconstructing images from dynamically evolving fMRI recordings. Our approach offers three main contributions. First, Dynadiff simplifies training as compared to existing approaches. Second, our model outperforms state-of-the-art models on time-resolved fMRI signals, especially on high-level semantic image reconstruction metrics, while remaining competitive on preprocessed fMRI data that collapse time. Third, this approach allows a precise characterization of the evolution of image representations in brain activity. Overall, this work lays the foundation for time-resolved brain-to-image decoding.

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