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Cinematic Mindscapes: High-Quality Video Reconstruction from Brain Activity (arxiv.org)
1 point by ftxbro on May 26, 2023 | hide | past | pdf | 1 comment on HN

In plain words: A system turns brain activity recorded while people watch videos into moving footage, learning from paired scans and clips to match what the brain sees. Its clips matched the real scenes' meaning 85% of the time, beating the previous best brain-to-video approach by 45%.

Abstract · Cinematic Mindscapes: High-quality Video Reconstruction from Brain Activity

Reconstructing human vision from brain activities has been an appealing task that helps to understand our cognitive process. Even though recent research has seen great success in reconstructing static images from non-invasive brain recordings, work on recovering continuous visual experiences in the form of videos is limited. In this work, we propose Mind-Video that learns spatiotemporal information from continuous fMRI data of the cerebral cortex progressively through masked brain modeling, multimodal contrastive learning with spatiotemporal attention, and co-training with an augmented Stable Diffusion model that incorporates network temporal inflation. We show that high-quality videos of arbitrary frame rates can be reconstructed with Mind-Video using adversarial guidance. The recovered videos were evaluated with various semantic and pixel-level metrics. We achieved an average accuracy of 85% in semantic classification tasks and 0.19 in structural similarity index (SSIM), outperforming the previous state-of-the-art by 45%. We also show that our model is biologically plausible and interpretable, reflecting established physiological processes.

Zijiao Chen, Jiaxin Qing, Juan Helen Zhou
arXiv:2305.11675 · cs.CV, cs.CE · submitted May 19, 2023
abstract · pdf · html · 15 pages, 11 figures, submitted to anonymous conference

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The recovered videos were evaluated with various semantic and pixel-level metrics. We achieved an average accuracy of 85% in semantic classification tasks and 0.19 in structural similarity index (SSIM), outperforming the previous state-of-the-art by 45%.

"It's a cat, moving" and "meh. Two people walking is good semantic match for person walking" levels of semantic match. (Both examples in the paper)

Structural similarity.. frankly it's bullshit. It's not even close for fidelity to subject by any human measure.

Still impressive but don't over dream it.

They should rerun the fMRI in 6/9/12/24 months with co founding imagery to test subjects octopus moving, six clowns walking. See how good retention of core semantics is if nothing else.