Rebroadcast: How the Bat Brain Knows Its Place

Have you ever spaced out while traveling somewhere but still made it to your destination effortlessly? Our brain is amazing at calculating exactly where we are relative to things around us, but this is a skill we often take for granted. In this episode, Producer Sama Ahmed talks with Dr. Michael Yartsev about how we know where we are in the world, how we make memories, and how we make decisions. Dr. Yartsev is uncovering all of this utilizing a rather unconventional and totally awesome animal: the bat! This episode is a re-release of an episode from 2013.

Run! for your brain: Gary Westbrook

At one point in your middle school or high school biology class, you may have learned that the number of neurons in your brain is set at birth. For examples your skin cells are constantly dying and being renewed. Your brain cells, on the other hand, cannot be renewed once they die.

In the last decade, however, scientists have discovered that this is not entirely true. A part of the brain called the hippocampus is one of the few sites for adult neurogenesis (the production of neurons after birth). Here, neurons are constantly being produced throughout life and incorporated into the current network of neurons. Interestingly, this part of the brain is important for the formation of episodic memories. Our guest this week, Gary Westbrook, Senior Scientist and Co-Director at the Vollum Institute at Oregon Health and Science University, is working to understand this important process. His lab is interested in what causes the production of new neurons and the incorporation of these neurons into existing neuronal networks. They have found that simple exercise is enough to increase the production of new neurons in rodents. Tune in to hear more about this vital and fascinating process.

More on the Westbrook Lab's research

How the bat brain knows its place: Michael Yartsev

The ability of animals to navigate through the world is essential for survival and has been studied by scientists for over 40 years. Scientists have identified neurons called “place cells” that reside in a part of the brain called the hippocampus. Individual place cells are active only when the animal is in a particular location in space, and populations of place cells work together to create an internal representation of the environment.

Up until now, experiments involving the hippocampus and place cells have been conducted in two-dimensional settings, often with rats running through a flat maze. Our guest this month, Dr. Michael Yartsev, a fellow at The Princeton Neuroscience Institute and previously the Weizmann Institute, is interested in how the 3D world is perceived in the brain. He hopes to figure this out by recording activity from place cells in the brains of flying bats. Listen as Dr. Yartsev describes this unique system to study an old question.

Hosted by Osama Ahmed, Karuna Meda

Makings of a memory: Loren Frank

The brain’s capacity to remember experiences to guide future decisions is an essential and fascinating ability. Our guest this month Loren Frank, an associate professor in the Keck Center for Integrative Neuroscience at UCSF, is working to understand this process.

Dr. Frank studies how the hippocampus, a brain structure required for the formation of memories, mediates spatial learning in rats. Within the hippocampus exist place cells: neurons that are activated whenever an animal is in a specific location in its environment. His lab records the neuronal activity of place cells during formation and “replay” of memories while rats explore their environment. Disrupting the “replay” prevents the long term formation of memory. Later in our interview, Dr. Frank discusses his initial interest in astrophysics and how he became interested in a career in neuroscience.

More on the Frank Lab's research

Memory of a relapse: Patricia Janak

In conjunction with being a professor at UCSF, Dr. Patricia Janak heads a lab at the Ernest Gallo Clinic and Research Center. There, Patricia and her fellow scientists tackle questions related to drug and alcohol abuse.

In this week’s episode, she shares with us some of her work on alcohol and drug addiction. Learn why some addicts have sudden cravings for drugs or alcohol and about the brain regions that are necessary for a relapse to happen.

More on the Janak Lab's research

Hosted by Sama Ahmed

Ignoring distractions helps you remember better: Adam Gazzaley

Dr. Adam Gazzaley is interested in the interface between attention and memory. In this installment, he tells us about the tools he’s using to study how distractions affect our ability to remember. He’s recently discovered that older adults have a hard time ignoring irrelevant information, and that this may have a huge negative effect on their memory. Find out how he’s building a video game to help people ignore distractions, and hopefully remember better.


More on the Gazzaley Lab's research

Hosted by Osama Ahmed