Which psychological framework in game design describes the cycle of 'trigger → action → reward → investment' that keeps players engaged and returning to games?

In the world of game design, psychological principles are carefully implemented to keep players coming back for more. One key concept has revolutionized how developers create addictive gameplay experiences, particularly in free-to-play and mobile games. This poll tests your knowledge about the psychological frameworks that drive player engagement and retention in modern gaming. Can you identify the correct term for this fundamental game design pattern that keeps players in a continuous cycle of motivation and reward?

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The Skinner Box Model
The Fogg Behavior Model
The Hook Model (or Engagement Loop)
The Flow State Paradigm