Karl Deisseroth has spent his life pursuing truths about the human mind, both as a practicing clinical psychiatrist and as a researcher who created the revolutionary field of optogenetics, which allows us to decipher the brain's inner workings using light. In
, he combines his groundbreaking access to the brain's inner circuitry with a deep empathy for his patients to examine what mental illness reveals about the mind and the origin of human feelings--how the broken can illuminate the unbroken.
An internationally acclaimed professor of bioengineering and psychiatry at Stanford, Deisseroth's true passion is clinical psychiatry, and it is the stories of his patients that form the backbone of
. Through these case studies, he tells the larger story of how we can understand the physical and biological origins of human emotion in the brain. As such, he describes vividly how humans experience feelings both in the simple and ancient circuits of our brains and in the poignant moments of suffering in our daily lives. The stories of Deisseroth's patients are rich with humanity and shine an unprecedented light on the self and the ways in which it breaks down. A young woman with an eating disorder reveals how the mind can rebel against the brain's most primitive drives of hunger and thirst; while an older gentleman, smothered into silence by depression and dementia, illuminates how humans evolved to feel joy and its absence; and a lonely Uyghur woman far from home teaches the importance of rich social bonds.
An illuminating and essential work,
transforms the way we understand the brain as a biological and as an emotional object.
A groundbreaking tour of the human mind that illuminates the biological nature of our inner worlds and emotions, through gripping, moving—and, at times, harrowing—clinical stories
“[A] scintillating and moving analysis of the human brain and emotions.”—Nature
“Beautifully connects the inner feelings within all human beings to deep insights from modern psychiatry and neuroscience.”—Robert Lefkowitz, Nobel Laureate

In this riveting journey through the hidden realms of the human mind, a world-renowned psychiatrist and neuroscientist explores the origins of human emotion, and examines what mental illnesses reveal about all of us - how the broken can illuminate the unbroken.Why do we feel what we feel?Mental illness is one of the greatest causes of human suffering, but the reasons we bear this burden, and the nature of these diseases, have remained mysterious. Now, our understanding has reached a tipping point. In Connections , Professor Karl Deisseroth intertwines gripping case studies from his experience as an emergency psychiatry physician, with breakthrough scientific discoveries from astounding new technology (including optogenetics, which he developed to allow turning specific brain cells on or off, with light).By linking insights from this technology to deeply moving stories of his patients and to our shared evolutionary history, Deisseroth tells a larger story about the origins of human emotion. A young woman with an eating disorder reveals how the mind can rebel against the brain's most primitive drives of hunger and thirst; an older man, smothered into silence by dementia, shows how humans evolved to feel joy and its absence; and a lonely Uyghur woman far from her homeland teaches both the importance - and challenges - of deep social bonds.Addressing some of the most timeless questions about the human condition while illuminating the roots of misunderstood disorders such as depression, psychosis, schizophrenia and sociopathy, Connections transforms the way we understand the brain, and our selves.

'Beautiful to read and packed with cutting-edge science' Observer

'Poetic, mind-stretching and, through it all, deeply human' Daniel Levitin Mental illness is one of the greatest causes of human suffering, its nature and origin a long-held mystery. But thanks to new science and technology, our understanding has reached a tipping point. In Connections, Professor Karl Deisseroth intertwines his own breakthrough discoveries with moving case studies from his experience as an emergency psychiatry physician, in order to tell a wider story about the origins of human emotion. Addressing some of the most timeless questions about the human condition while illuminating the roots of misunderstood disorders such as depression, psychosis, schizophrenia and sociopathy, Connections transforms the way we understand the brain, and forges a bold new path forward in our understanding of mental health. 'Revelatory . . . it recalls the case histories of Oliver Sacks, at times the sweep of Yuval Harari's Sapiens. He writes with an evident love of words - but also, with a lucid line of scientific enquiry' Guardian

'A master storyteller. His graceful prose weaves a tapestry of complex ideas into memorable stories, each illuminated by cutting-edge science. A delight' Kathryn Mannix, author of With the End in Mind