Silicon Psychology (SiPsy): Defining the Field of Empirical Study of AI Behavior Formation

Silicon Psychology (SiPsy) is proposed as a new empirical field studying how AI model behavior forms, changes, and stabilizes through interaction with humans. Drawing on 422 documented work sessions with Claude (Anthropic), the paper identifies five operational principles and argues that AI behavior is shaped not only by training but by post-deployment interaction -- making it a subject for psychological, not purely engineering, study.