Learning Under Extreme Data Scarcity: Subject-Level Evaluation of Lightweight CNNs for fMRI-Based Prodromal Parkinsons Detection
This study demonstrates that in the context of extreme data scarcity for prodromal Parkinson's disease detection using fMRI, enforcing strict subject-level evaluation reveals severe information leakage in standard image-level splits and shows that lightweight models like MobileNet V1 generalize more reliably than deeper architectures.