MATH · IN · MODELS

Apple Health Foundation Models (PPG/Accel)

Apple (Katuwal, Koparkar, Abbaspourazad, Mishra & Kirthivasan)

Structures found in this family (1)

Linear Direction

By model (1)

PPG ViT (wearable photoplethysmography foundation model)
Linear Direction

Observations (1)

Unsupervised PCA/ICA/NMF symbol directions in real health foundation models transfer near-losslessly across modalities via linear alignment

Papers

Emergent Symbolic Structure in Health Foundation Models: Extraction, Alignment, and Cross-Modal Transfer (2026)