The Human Brain in the Age of Insight: Eric Kandel Live on Big Think
Dr. Eric Kandel is University Professor and Fred Kavli Professor and Director of the Kavli Institute for Brain Science at the Columbia University College of Physicians and Surgeons. His most recent book is The Age of Insight: The Quest to Understand the Unconscious in Art, Mind, and Brain, from Vienna 1900 to the Present.
By probing the synaptic connections between nerve cells in the humble sea slug, Eric Kandel has uncovered some of the basic molecular mechanisms underlying learning and memory in animals ranging from snails to flies to mice and even in humans. His groundbreaking studies have demonstrated the fundamental ways that nerve cells alter their response to chemical signals to produce coordinated changes in behavior. This work is central to understanding not only normal memory but also dementia and other mental illnesses that affect memory.
Kandel's research has shown that learning produces changes in behavior by modifying the strength of connections between nerve cells, rather than by altering the brain's basic circuitry. He went on to determine the biochemical changes that accompany memory formation, showing that short-term memory involves a functional modulation of the synapses while long-term memory requires the activation of genes and the synthesis of proteins to grow new synaptic connections. For this work, the Austrian-born Kandel was awarded the 2000 Nobel Prize in Physiology or Medicine.
The traumatic events of Kandel's childhood likely influenced his later interest in the biological mechanisms of memory. He was only eight when, in 1938, Nazi Germany annexed his homeland, but the humiliation and discrimination that Kandel, his family, and other Jews suffered under this oppressive regime were forever seared into his memory. In 1939, on the eve of World War II, his family fled Austria for the United States.
As a college student at Harvard, Kandel majored in history and literature, but he was drawn to psychoanalysis after befriending a native Austrian student whose parents were prominent psychoanalysts in Sigmund Freud's circle. Kandel went to medical school at New York University with the goal of studying psychiatry and becoming a psychoanalyst himself. But thinking that he should know more about how the brain works, he took a neurophysiology course that shifted his interest toward research into the biology of memory. "The cell and molecular mechanisms of learning and memory struck me as a wonderful problem to study … It was clear to me even then that learning and memory were central to behavior, and thus to psychopathology and to psychotherapy," Kandel recalled.
Initially, he focused on recording the activity of nerve cells in the hippocampus, a region of the brain vital to memory formation. The mammalian hippocampus, however, with its seemingly infinite number of neurons and synaptic connections, made it difficult to study learning and memory at the cellular level. Kandel soon realized he needed a simpler system and chose the invertebrate sea slug Aplysia, much to the dismay of his colleagues who thought that no self-respecting neurophysiologist would abandon the study of learning in mammals to work on an invertebrate.
This bold decision paid off, though, and Kandel now works to instill in his students a sense that risk-taking is important to good science. "I try to convey to students my love of science and my conviction that exploring the biology of the brain is an unmatched scientific adventure," he explained. "I also encourage them to think boldly and to work carefully; to take gambles on their ideas and to try new approaches. I also tell them never to be embarrassed in exposing their ignorance … We are all here to learn, and the learning never ends."
More recently, Kandel has expanded his studies of simple learning and memory in Aplysia to include more complex forms of memory storage in genetically modified mice. These studies have focused on explicit memory (the conscious recall of information about places and objects), revealing the importance of a balance of activation and inhibition in memory storage so that animals as well as humans do not store information in their memories that is not important to recall.
In his latest book The Age of Insight: The Quest to Understand the Unconscious in Art, Mind and Brain from Vienna 1900 to the Present, Nobel Prize winner Eric Kandel talks about the intersection between theories of creativity and brain science. He responds to viewer-submitted questions in this livestream interview, originally recorded on March 22, 2012.
Explore how alcohol affects your brain, from the first sip at the bar to life-long drinking habits.
- Alcohol is the world's most popular drug and has been a part of human culture for at least 9,000 years.
- Alcohol's effects on the brain range from temporarily limiting mental activity to sustained brain damage, depending on levels consumed and frequency of use.
- Understanding how alcohol affects your brain can help you determine what drinking habits are best for you.
If you want to know what makes a Canadian lynx a Canadian lynx a team of DNA sequencers has figured that out.
- A team at UMass Amherst recently sequenced the genome of the Canadian lynx.
- It's part of a project intending to sequence the genome of every vertebrate in the world.
- Conservationists interested in the Canadian lynx have a new tool to work with.
If you want to know what makes a Canadian lynx a Canadian lynx, I can now—as of this month—point you directly to the DNA of a Canadian lynx, and say, "That's what makes a lynx a lynx." The genome was sequenced by a team at UMass Amherst, and it's one of 15 animals whose genomes have been sequenced by the Vertebrate Genomes Project, whose stated goal is to sequence the genome of all 66,000 vertebrate species in the world.
Sequencing the genome of a particular species of an animal is important in terms of preserving genetic diversity. Future generations don't necessarily have to worry about our memory of the Canadian Lynx warping the way hearsay warped perception a long time ago.
Artwork: Guillaume le Clerc / Wikimedia Commons
13th-century fantastical depiction of an elephant.
It is easy to see how one can look at 66,000 genomic sequences stored away as being the analogous equivalent of the Svalbard Global Seed Vault. It is a potential tool for future conservationists.
But what are the practicalities of sequencing the genome of a lynx beyond engaging with broad bioethical questions? As the animal's habitat shrinks and Earth warms, the Canadian lynx is demonstrating less genetic diversity. Cross-breeding with bobcats in some portions of the lynx's habitat also represents a challenge to the lynx's genetic makeup. The two themselves are also linked: warming climates could drive Canadian lynxes to cross-breed with bobcats.
John Organ, chief of the U.S. Geological Survey's Cooperative Fish and Wildlife units, said to MassLive that the results of the sequencing "can help us look at land conservation strategies to help maintain lynx on the landscape."
What does DNA have to do with land conservation strategies? Consider the fact that the food found in a landscape, the toxins found in a landscape, or the exposure to drugs can have an impact on genetic activity. That potential change can be transmitted down the generative line. If you know exactly how a lynx's DNA is impacted by something, then the environment they occupy can be fine-tuned to meet the needs of the lynx and any other creature that happens to inhabit that particular portion of the earth.
Given that the Trump administration is considering withdrawing protection for the Canadian lynx, a move that caught scientists by surprise, it is worth having as much information on hand as possible for those who have an interest in preserving the health of this creature—all the way down to the building blocks of a lynx's life.
The exploding popularity of the keto diet puts a less used veggie into the spotlight.
- The cauliflower is a vegetable of choice if you're on the keto diet.
- The plant is low in carbs and can replace potatoes, rice and pasta.
- It can be eaten both raw and cooked for different benefits.
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