The co-inventor of Apple’s FaceID and Vision Pro technology, Gidi Littwin, has spent the past six years building a frontier artificial intelligence model through his startup, Hemispheric, which has raised $52 million in funding after gathering data on 100,000 people’s brains. Littwin left Apple in 2020 and was cold-messaged on LinkedIn by cofounder Hagai Lalazar, who had spoken to around 75 candidates and was developing AI to study the brain without surgery. Hemispheric collected a quarter of a million hours of brain data from 100,000 paid volunteers across Asia, Tel Aviv, and Boston, using activities that activated different brain parts. The frontier model infers brain function from electrical activity within the skull, and tests on subsets including those diagnosed with PTSD, schizophrenia, and depression yielded accurate deductions about brain health. The team is working on a clinical study for Alzheimer’s diagnosis and prediction. Hemispheric will submit its first product, for studying PTSD, to the FDA for approval early next year, aiming for public rollout later in 2027. A patient wears a lightweight EEG headset for around 15 minutes while interacting with an app, and the AI model helps clinicians decode signals to diagnose, select interventions, and monitor progress.