Crabtree says the ancient Greeks were likely more intelligent than a modern human. Crabtree has recently conducted research which he said indicates that the human, with the passage of time, becomes less intelligent.
According to Australian press reports, the American scientist argued that some inevitable changes in our genetic system, combined with the technological developments, led us to turn into a mutilated body of our former substance, much less intelligent than our ancestors.
Crabtree alleges that the human being was in his prime when he was forced to fight with all his strength to survive, as he was obliged to rely on his memory, in his practical esprit and psychological balance that allowed him to trust his instinct and adapt easily to different circumstances.
“I would wager that if an average citizen from Athens of 1000 B.C. were to appear suddenly among us, he or she would be among the brightest and most intellectually alive of our colleagues and companions, with a good memory, a broad range of ideas, and a clear-sighted view of important issues,” he said.
He added that, “I would guess that he or she would be among the most emotionally stable of our friends and colleagues. I would also make this wager for the ancient inhabitants of Africa, Asia, India or the Americas, of perhaps 2000–6000 years ago. The basis for my wager comes from new developments in genetics, anthropology, and neurobiology that make a clear prediction that our intellectual and emotional abilities are genetically surprisingly fragile.”