Psychologist Jerome Kagan leaves no stone unturned in his quest to determine what makes us distinctly human. His latest book, The Human Spark: The science of human development, comes up with some fresh conclusions.
From the New Scientist:
What is it that makes humans special, that sets our species apart from all others? It must be something connected with intelligence – but what exactly? People have asked these questions for as long as we can remember. Yet the more we understand the minds of other animals, the more elusive the answers to these questions have become.
The latest person to take up the challenge is Jerome Kagan, a former professor at Harvard University. And not content with pinning down the “human spark” in the title of his new book, he then tries to explain what makes each of us unique.
As a pioneer in the science of developmental psychology, Kagan has an interesting angle. A life spent investigating how a fertilised egg develops into an adult human being provides him with a rich understanding of the mind and how it differs from that of our closest animal cousins.
Human and chimpanzee infants behave in remarkably similar ways for the first four to six months, Kagan notes. It is only during the second year of life that we begin to diverge profoundly. As the toddler’s frontal lobes expand and the connections between the brain sites increase, the human starts to develop the talents that set our species apart. These include “the ability to speak a symbolic language, infer the thoughts and feelings of others, understand the meaning of a prohibited action, and become conscious of their own feelings, intentions and actions”.
Becoming human, as Kagan describes it, is a complex dance of neurobiological changes and psychological advances. All newborns possess the potential to develop the universal human properties “inherent in their genomes”. What makes each of us individual is the unique backdrop of genetics, epigenetics, and the environment against which this development plays out.
Kagan’s research highlighted the role of temperament, which he notes is underpinned by at least 1500 genes, affording huge individual variation. This variation, in turn, influences the way we respond to environmental factors including family, social class, culture and historical era.
But what of that human spark? Kagan seems to locate it in a quartet of qualities: language, consciousness, inference and, especially, morality. This is where things start to get weird. He would like you to believe that morality is uniquely human, which, of course, bolsters his argument. Unfortunately, it also means he has to deny that a rudimentary morality has evolved in other social animals whose survival also depends on cooperation.
Instead, Kagan argues that morality is a distinctive property of our species, just as “fish do not have lungs”. No mention of evolution. So why are we moral, then? “The unique biology of the human brain motivates children and adults to act in ways that will allow them to arrive at the judgement that they are a good person.” That’s it?
Warming to his theme, Kagan argues that in today’s world, where traditional moral standards have been eroded and replaced by a belief in the value of wealth and celebrity, it is increasingly difficult to see oneself as a good person. He thinks this mismatch between our moral imperative and Western culture helps explain the “modern epidemic” of mental illness. Unwittingly, we have created an environment in which the human spark is fading.
Some of Kagan’s ideas are even more outlandish, surely none more so than the assertion that a declining interest in natural sciences may be a consequence of mothers becoming less sexually mysterious than they once were. More worryingly, he doesn’t seem to believe that humans are subject to the same forces of evolution as other animals.
Read the entire article here.