Preprint Open access
FlatClip: A Geometry-Aware Surface-Level Baseline for fMRI Representation Learning
Recent fMRI foundation models differ substantially in the spatial scale at which they represent brain activity. ROI- and connectivity-based models are efficient but coarse, whereas voxel-level models preserve fine-grained spatial structure but require specialized 3D/4D architectures and costly fMRI-specific pretraining …