How did William James connect instincts with human behavior?

In his seminal 1890 work, The Principles of Psychology, William James argued that many human behaviors are driven by instincts, which he defined as inherited predispositions to respond to specific stimuli in adaptive ways.1

James viewed these instincts as functional tools that help an organism navigate its environment and survive. A primary example he used to illustrate this concept was the sneeze—a rapid, involuntary blast of air triggered by a nasal irritant to clear the airway. By framing behavior through this biological lens, James helped establish the functional point of view in psychology, treating mental processes and behaviors as instruments in the struggle to live.12

While James was instrumental in introducing these ideas, he remained critical of how others categorized human emotions. He famously argued that attempts to create rigid taxonomies of emotions were often "fictitious or unimportant" and that their claims to accuracy were "a sham," highlighting his skepticism toward overly complex or subjective classifications of instinctual behavior.3