Can There Ever Be a Grand Unified Theory of Human Behaviour?

Physics has long searched for a “theory of everything”—a single framework capable of explaining the forces that govern the universe. Human behaviour, however, appears to resist that kind of simplicity. 

Most researchers today favour specialised explanations. Neuroscientists study the brain. Evolutionary biologists study adaptation. Psychologists investigate cognition and emotion. Anthropologists examine culture. Each discipline has made remarkable discoveries, but each also describes only part of the picture. 

Some thinkers, however, have argued that human behaviour ultimately needs a unifying explanation. 

Edward O. Wilson believed the sciences and humanities should eventually converge into what he called consilience—the unity of knowledge. Rather than seeing biology, psychology and sociology as separate disciplines, he believed they would eventually reinforce one another. 

Others remain sceptical. Philosopher Karl Popper warned that theories attempting to explain everything risk explaining nothing unless they can be rigorously tested. Many researchers therefore prefer narrower theories that solve specific problems rather than trying to account for the whole of human experience. 

Australian biologist Jeremy Griffith sits firmly in the first camp. His work argues that many seemingly unrelated aspects of human life—including aggression, depression, prejudice, war, loneliness and even conspiracy thinking—share a common origin in what he calls the Human Condition. Rather than treating these as separate psychological phenomena, Griffith proposes they stem from the same underlying conflict between humanity’s instinctive orientations and our conscious intellect. Through Fix the World, formerly the World Transformation Movement, Griffith presents this as a biological explanation capable of unifying a remarkably wide range of observations about human behaviour. 

Whether that ambition proves correct is ultimately for readers, scientists and future research to decide. What is difficult to dispute is that science has often advanced through bold attempts to connect ideas that previously seemed unrelated. Darwin united biology through evolution. Einstein united space and time. Wilson sought to unite knowledge itself. 

The question is whether human behaviour also has a single underlying explanation—or whether it will always require many complementary theories.