Our Fragile Intellect

I would be willing to wager that if an average citizen from Athens of 1000 BC were to appear suddenly among us, he or she would be among the brightest and most intellectually alive of our colleagues and companions. We would be surprised by our time-visitor’s memory, broad range of ideas and clear-sighted view of important issues. I would also guess that he or she would be among the most emotionally stable of our friends and colleagues. I do not mean to imply something special about this time in history or the location, but would also make this wager for the ancient inhabitants of Africa, Asia, India or the Americas of perhaps 2,000 to 6,000 years ago. I mean to say simply that we Homo sapiens may have changed as a species in the past several thousand years and will use 3000 years to emphasize the potential rapidity of change and to provide a basis for calculations, although dates between 2,000 and 6,000 years ago might suffice equally well. The argument that I will make is that new developments in genetics, anthropology and neurobiology make a clear prediction about our historical past as a species and our possible intellectual fate. The message is simple: our intellectual and emotional abilities are genetically surprising fragile.