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"The Dangerous Passion Jealousy is not only inbred in human nature, but it is the most basic, all-pervasive emotion which touches man in all aspects of every human relationship. - Boris Sokoloff, 1947, Jealousy: A Psychological Study Every human alive is an evolutionary success story. If any of our ancestors had failed to survive an ice age, a drought, a predator, or a plague, they would not be our ancestors. If any had failed to cooperate with at least some others in the group or dropped below a minimal position in the social hierarchy, they would have met certain death by being cast out from the group. If even one had failed to succeed in choosing, courting, and keeping a mate, the previously inviolate chain of descent would have irreparably broken, and we would not be alive to tell the tale. Each of us owes our existence to thousands of generations of successful ancestors. As their descendants, we have inherited the passions that led to their success - passions that drive us, often blindly, through a lifelong journey in the struggle for survival, the pursuit of position, and the search for relationships. "

"Science all but confirms that humans are hard-wired to respond to music. Studies also suggest that someday music may even help patients heal from Parkinson's disease or a stroke. In The Power of Music, Elena Mannes explores how music affects different groups of people and how it could play a role in health care. Mannes tracked the human relationship with music over the course of a life span. She tells NPR's Neal Conan that studies show that infants prefer "consonant intervals, the smooth-sounding ones that sound nice to our Western ears in a chord, as opposed to a jarring combination of notes." In fact, Mannes says the cries of babies just a few weeks old were found to contain some of the basic intervals common to Western music. She also says scientists have found that music stimulates more parts of the brain than any other human function. That's why she sees so much potential in music's power to change the brain and affect the way it works. Mannes says music also has the potential to help people with neurological deficits. "A stroke patient who has lost verbal function - those verbal functions may be stimulated by music," she says. One technique, known as melodic intonation therapy, uses music to coax portions of the brain into taking over for those that are damaged. In some cases, it can help patients regain their ability to speak. And because of how we associate music with memories, Mannes says such techniques could also be helpful for Alzheimer's patients. Less recently, archaeologists have discovered ancient flutes - one of which is presumed to be the oldest musical instrument in the world - that play a scale similar to the modern Western scale. "And remarkably," Mannes says, "this flute, when played, produces these amazingly pure tones." It's a significant discovery because it adds to the argument that musical ability and interest were present early in human history."

"As neurologists, psychologists and biologists have zeroed in more and more precisely on the physical causes of mental disorders, they have found themselves addressing a much deeper mystery, a set of interrelated conundrums probably as old as humanity: What, precisely, is the mind, the elusive entity where intelligence, decision making, perception, awareness and sense of self reside? Where is it located? How does it work? Does it arise from purely physical processes-pulses of electricity zapping from brain cell to brain cell, helped along their way by myriad complex chemicals? Or is it something beyond the merely physical-something ethereal that might be close to the spiritual concept of the soul? Great thinkers have had no shortage of ideas on the subject. Plato was convinced that the mind must be located inside the head, because the head is shaped more or less like a sphere, his idea of the highest geometrical form. Aristotle insisted that the mind was in the heart. His reasoning: warmth implies vitality; the blood is warm; the heart pumps the blood. By the Middle Ages, though, pretty much everyone agreed that the mind arose from the brain -- but still had no clear idea how it arose. Finally, in the 17th century, the French philosopher Rena Descartes declared that the mind, while it might live in the brain, was a nonmaterial thing, entirely separate from the physical tissues found inside the head. Furthermore, said Descartes in one of history's most memorable sound bites, "Cogito, ergo sum" (I think, therefore I am). His point: consciousness is the only sure evidence that we actually exist. Until just a few years ago, unraveling the relationship of mind and brain was beyond the realm of observation and experimentation. But science has finally begun to catch up with philosophy. Using sensitive electrodes inserted deep into the gray matter of test animals, researchers have watched vision as it percolates inward from the eye's retina to the inner brain. Powerful te

"It is unusual for the subtitle of a book to undersell it, but Steven Pinker's "Better Angels of Our Nature" tells us much more than why violence has declined. Pinker, a professor of psychology at Harvard who first became widely known as the author of "The Language Instinct," addresses some of the biggest questions we can ask: Are human beings essentially good or bad? Has the past century witnessed moral progress or a moral collapse? Do we have grounds for being optimistic about the future?"

"FOR a brief, heady period in the history of autism spectrum diagnosis, in the late '90s, I had Asperger syndrome. There's an educational video from that time, called "Understanding Asperger's," in which I appear. I am the affected 20-year-old in the wannabe-hipster vintage polo shirt talking about how keen his understanding of literature is and how misunderstood he was in fifth grade. The film was a research project directed by my mother, a psychology professor and Asperger specialist, and another expert in her department. It presents me as a young man living a full, meaningful life, despite his mental abnormality. "Understanding Asperger's" was no act of fraud. Both my mother and her colleague believed I met the diagnostic criteria laid out in the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition. The manual, still the authoritative text for American therapists, hospitals and insurers, listed the symptoms exhibited by people with Asperger disorder, and, when I was 17, I was judged to fit the bill. I exhibited a "qualified impairment in social interaction," specifically "failure to develop peer relationships appropriate to developmental level" (I had few friends) and a "lack of spontaneous seeking to share enjoyment, interests, or achievements with other people" (I spent a lot of time by myself in my room reading novels and listening to music, and when I did hang out with other kids I often tried to speak like an E. M. Forster narrator, annoying them). I exhibited an "encompassing preoccupation with one or more stereotyped and restricted patterns of interest that is abnormal either in intensity or focus" (I memorized poems and spent a lot of time playing the guitar and writing terrible poems and novels). The general idea with a psychological diagnosis is that it applies when the tendencies involved inhibit a person's ability to experience a happy, normal life. And in my c