Learning to forge connections through eye contact helped her get audiences more engaged during presentations, says Ms. Kruse, vice president of learning at FortuneBuilders, San Diego.
Stillwell says companies are already using these kinds of machine-learning models to make connections, though the companies may not know that they're measuring IQ or extroversion.
He later became a neuroscientist, now at the Massachusetts Institute of Technology, spending most of his career doing basic research on how the brain's cells form connections during learning.