The identical “Jim twins” were raised in separate families and met for the first time at age thirty-nine, only to discover that they both suffered tension headaches, bit their fingernails, smoked Salems, enjoyed woodworking, and vacationed on the same Florida beach. This example of the potential power of genetics captured widespread media attention in 1979 and inspired the Minnesota Study of Twins Reared Apart. This landmark investigation into the nature-nurture debate shook the scientific community by demonstrating, across a number of traits, that twins reared separately are as alike as those raised together.
As a postdoctoral fellow and then as assistant director of the Minnesota Study, Nancy L. Segal provides an eagerly anticipated overview of its scientific contributions and their effect on public consciousness. The study’s evidence of genetic influence on individual differences in traits such as personality (50%) and intelligence (70%) overturned conventional ideas about parenting and teaching. Treating children differently and nurturing their inherent talents suddenly seemed to be a fairer approach than treating them all the same. Findings of genetic influence on physiological characteristics such as cardiac and immunologic function have led to more targeted approaches to disease prevention and treatment. And indications of a stronger genetic influence on male than female homosexuality have furthered debate regarding sexual orientation.
“This is an important book and likely the most thoughtful of the year in the social sciences… Highly recommended, it is likely to prove one of the most thought-provoking books of the year.”—Tyler Cowen, Marginal Revolution
How did human minds become so different from those of other animals? What accounts for our capacity to understand the way the physical world works, to think ourselves into the minds of others, to gossip, read, tell stories about the past, and imagine the future? These questions are not new: they have been debated by philosophers, psychologists, anthropologists, evolutionists, and neurobiologists over the course of centuries. One explanation widely accepted today is that humans have special cognitive instincts. Unlike other living animal species, we are born with complicated mechanisms for reasoning about causation, reading the minds of others, copying behaviors, and using language.
Cecilia Heyes agrees that adult humans have impressive pieces of cognitive equipment. In her framing, however, these cognitive gadgets are not instincts programmed in the genes but are constructed in the course of childhood through social interaction. Cognitive gadgets are products of cultural evolution, rather than genetic evolution. At birth, the minds of human babies are only subtly different from the minds of newborn chimpanzees. We are friendlier, our attention is drawn to different things, and we have a capacity to learn and remember that outstrips the abilities of newborn chimpanzees. Yet when these subtle differences are exposed to culture-soaked human environments, they have enormous effects. They enable us to upload distinctively human ways of thinking from the social world around us.
As Cognitive Gadgets makes clear, from birth our malleable human minds can learn through culture not only what to think but how to think it.
"When we grasp fully that the best expressions of our humanity were not invented by civilization but by cultures that preceded it, that the natural world is not only a set of constraints but of contexts within which we can more fully realize our dreams, we will be on the way to a long overdue reconciliation between opposites which are of our own making." --from Coming Home to the Pleistocene
Paul Shepard was one of the most profound and original thinkers of our time. Seminal works like The Tender Carnivore and the Sacred Game, Thinking Animals, and Nature and Madness introduced readers to new and provocative ideas about humanity and its relationship to the natural world. Throughout his long and distinguished career, Paul Shepard returned repeatedly to his guiding theme, the central tenet of his thought: that our essential human nature is a product of our genetic heritage, formed through thousands of years of evolution during the Pleistocene epoch, and that the current subversion of that Pleistocene heritage lies at the heart of today's ecological and social ills.
Coming Home to the Pleistocene provides the fullest explanation of that theme. Completed just before his death in the summer of 1996, it represents the culmination of Paul Shepard's life work and constitutes the clearest, most accessible expression of his ideas. Coming Home to the Pleistocene pulls together the threads of his vision, considers new research and thinking that expands his own ideas, and integrates material within a new matrix of scientific thought that both enriches his original insights and allows them to be considered in a broader context of current intellectual controversies. In addition, the book explicitly addresses the fundamental question raised by Paul Shepard's work: What can we do to recreate a life more in tune with our genetic roots? In this book, Paul Shepard presents concrete suggestions for fostering the kinds of ecological settings and cultural practices that are optimal for human health and well-being.
Coming Home to the Pleistocene is a valuable book for those familiar with the life and work of Paul Shepard, as well as for new readers seeking an accessible introduction to and overview of his thought.
In a remarkable synthesis of the research of the last two decades, a leading developmental neuroscientist provides psychologists with a sophisticated introduction to the brain—the system that underpins the functions that they study.
In clear terms, with ample illustrations, Joan Stiles explains the complexities of genetic variation and transcription, and the variable paths of neural development, from embryology through early childhood. She describes early developmental processes from gene expression to physiology to behavior. Sections on clinical correlations show the consequences for later physiological, neurological, or psychological disturbances in neural development.
As Stiles shows, brain development is far more complex and dynamic than is often assumed in debates about nature vs. nurture, nativism vs. cultural learning. Inherited and experienced factors interact constantly in an ever-changing organism. The key question is, what developmental processes give rise to particular structures or mechanisms?
A landmark of synthesis and interdisciplinary illumination, The Fundamentals of Brain Development will enrich discussion of developmental processes and more rigorously define the terms that are central to psychological debates.
Radhakrishnan develops his rationale of the “between” through three linked essays where he locates the terms “world,” “history,” “human,” and “subject” between phenomenology and poststructuralism, and in the process sets forth a nuanced reading of the politics of a gendered postcolonial humanism. Critically juxtaposing the works of thinkers such as Friedrich Nietzsche, Adrienne Rich, Frantz Fanon, Edward Said, Michel Foucault, Maurice Merleau-Ponty, Martin Heidegger, David Harvey, and Ranajit Guha, Radhakrishnan examines the relationship between systems of thought and their worldly situations. History, the Human, and the World Between is a powerful argument for a theoretical perspective that combines the existential urgency of phenomenology with the discursive rigor of poststructuralist practices.
A historian of science examines key public debates about the fundamental nature of humans to ask why a polarized discourse about nature versus nurture became so entrenched in the popular sciences of animal and human behavior.
Are humans innately aggressive or innately cooperative? In the 1960s, bestselling books enthralled American readers with the startling claim that humans possessed an instinct for violence inherited from primate ancestors. Critics responded that humans were inherently loving and altruistic. The resulting debate—fiercely contested and highly public—left a lasting impression on the popular science discourse surrounding what it means to be human.
Killer Instinct traces how Konrad Lorenz, Robert Ardrey, and their followers drew on the sciences of animal behavior and paleoanthropology to argue that the aggression instinct drove human evolutionary progress. Their message, spread throughout popular media, brought pointed ripostes. Led by the anthropologist Ashley Montagu, opponents presented a rival vision of human nature, equally based in biological evidence, that humans possessed inborn drives toward love and cooperation. Over the course of the debate, however, each side accused the other of holding an extremist position: that behavior was either determined entirely by genes or shaped solely by environment. Nadine Weidman shows that what started as a dispute over the innate tendencies of animals and humans transformed into an opposition between nature and nurture.
This polarized formulation proved powerful. When E. O. Wilson introduced his sociobiology in 1975, he tried to rise above the oppositional terms of the aggression debate. But the controversy over Wilson’s work—led by critics like the feminist biologist Ruth Hubbard—was ultimately absorbed back into the nature-versus-nurture formulation. Killer Instinct explores what happens and what gets lost when polemics dominate discussions of the science of human nature.
Facts are facts, we often say with certainty; but values--well, they're relative. But every day we are confronted with situations where these simple distinctions begin to blur--whether our concerns are the roots of crime and violence, the measure of intelligence, the causes of disease, the threat and promise of genetic engineering. Where do our "facts" end and our "values" begin?
Recent developments in neuroscience have begun to shed light on this confusion, by radically revising our notions of where human nature ends and human nurture begins. As Edward Hundert--a philosopher, psychiatrist, and award-winning educator--makes clear in this eloquent interdisciplinary work, the newly emerging model for the interactions of brain and environment has enormous implications for our understanding of who we are, how we know, and what we value.
Lessons from an Optical Illusion is a bold modern recasting of the age-old nature-nurture debate, informed by revolutionary insights from brain science, artificial intelligence, psychiatry, linguistics, evolutionary biology, child development, ethics, and even cosmology. As this radical new synthesis unfolds, we are introduced to characters ranging from Immanuel Kant to Gerald Edelman, from Charles Darwin to Sigmund Freud, from Jean Piaget to Stephen Hawking, from Socrates to Jonas Salk. Traversing the nature-nurture terrain, we encounter simulated robots, optical illusions, game theory, the anthropic principle, the prisoner's dilemma, and the language instinct. In the course of Hundert's wide-ranging exploration, the comfortable dichotomies that once made sense (objectivity-subjectivity, heredity-environment, fact-value) break down under sharp analysis, as he reveals the startling degree to which facts are our creations and values are woven into the fabric of the world. Armed with an updated understanding of how we became who we are and how we know what we know, readers are challenged to confront anew the eternal question of what it means to live a moral life.
We have seen these children—the shy and the sociable, the cautious and the daring—and wondered what makes one avoid new experience and another avidly pursue it. At the crux of the issue surrounding the contribution of nature to development is the study that Jerome Kagan and his colleagues have been conducting for more than two decades. In The Long Shadow of Temperament, Kagan and Nancy Snidman summarize the results of this unique inquiry into human temperaments, one of the best-known longitudinal studies in developmental psychology. These results reveal how deeply certain fundamental temperamental biases can be preserved over development.
Identifying two extreme temperamental types—inhibited and uninhibited in childhood, and high-reactive and low-reactive in very young babies—Kagan and his colleagues returned to these children as adolescents. Surprisingly, one of the temperaments revealed in infancy predicted a cautious, fearful personality in early childhood and a dour mood in adolescence. The other bias predicted a bold childhood personality and an exuberant, sanguine mood in adolescence. These personalities were matched by different biological properties. In a masterly summary of their wide-ranging exploration, Kagan and Snidman conclude that these two temperaments are the result of inherited biologies probably rooted in the differential excitability of particular brain structures. Though the authors appreciate that temperamental tendencies can be modified by experience, this compelling work—an empirical and conceptual tour-de-force—shows how long the shadow of temperament is cast over psychological development.
A Marginal Revolution Book of the Year
After tracking the lives of thousands of people from birth to midlife, four of the world’s preeminent psychologists reveal what they have learned about how humans develop.
Does temperament in childhood predict adult personality? What role do parents play in shaping how a child matures? Is day care bad—or good—for children? Does adolescent delinquency forecast a life of crime? Do genes influence success in life? Is health in adulthood shaped by childhood experiences? In search of answers to these and similar questions, four leading psychologists have spent their careers studying thousands of people, observing them as they’ve grown up and grown older. The result is unprecedented insight into what makes each of us who we are.
In The Origins of You, Jay Belsky, Avshalom Caspi, Terrie Moffitt, and Richie Poulton share what they have learned about childhood, adolescence, and adulthood, about genes and parenting, and about vulnerability, resilience, and success. The evidence shows that human development is not subject to ironclad laws but instead is a matter of possibilities and probabilities—multiple forces that together determine the direction a life will take. A child’s early years do predict who they will become later in life, but they do so imperfectly. For example, genes and troubled families both play a role in violent male behavior, and, though health and heredity sometimes go hand in hand, childhood adversity and severe bullying in adolescence can affect even physical well-being in midlife.
Painstaking and revelatory, the discoveries in The Origins of You promise to help schools, parents, and all people foster well-being and ameliorate or prevent developmental problems.
The second year is that daunting time when the previously docile and adorable infant inevitably develops a mind of her own. In this book, Jerome Kagan takes a provocative look at the mental developments underlying the startling transitions in the child’s second year.
It is Kagan’s premise that the roots of self-awareness emerge in the second half of the second year of life. He also suggests that the underlying cause may be more biological than social. His book develops these ideas through a series of brilliant observations on the behavior of two-year-olds.
Kagan charts, for example, the emerging sense of standards (the possibility of right and wrong) that reveals itself positively when the child suddenly begins to smile after a successful action, and negatively when the child starts to become concerned about flaws in objects and mistakes in her own behavior. When this concern with standards spreads to the child’s irresistible impulse to imitate adults, Kagan observes a remarkable phenomenon: the twenty-month-old child suddenly begins to show signs of distress before she even tries to imitate an action that is beyond her ability. Kagan argues that this distress could arise only from the child’s growing sense of what she can and can’t do—her awareness of herself.
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