Vision and the Brain, Jellypalooza. Sept 29, 2023, Part 1

A neuroscientist discusses how your brain filters visual inputs. Plus, two stories about jellyfish -- tracking a freshwater jelly that’s spreading across the US, and the surprising finding that one species of jelly may be able to learn.

After 7 Years, NASA Gets Its Asteroid Sample

About a week ago, space nerds got the delivery of a lifetime: a sample from Bennu, an asteroid soaring through the galaxy, currently about 200 million miles away. The capsule of rocks and dust came courtesy of NASA’s OSIRIS-REx, the first U.S. mission to collect a sample from an asteroid.

Scientists hope it’ll help unveil some of the mysteries of our universe, like how the sun and planets came to exist or how life began. Guest host and musician Dessa talks with Sophie Bushwick, technology editor at Scientific American, about this week in science. They also chat about how antimatter interacts with gravity, the new RSV vaccine for pregnant people, why LED streetlights are turning purple, and how beetles came to dominate all other species, especially ants.

How You See With Your Brain

Ever try to take a picture of a spectacular moon that looks like it fills up half the sky? And then you look at the photo, and the moon looks like a tiny dumb ping-pong ball? And you want to march into the Apple store and demand to know why this pocket-size device fails to capture the wonder of the cosmos properly? 

The majesty of that supermoon you saw might be in your head as much as it is in the sky—your brain does a lot more than just receive data reports from your eyes. Vision is complicated. Seeing involves a lot of interpretation, of which you’re usually unaware. 

Guest host and musician Dessa talks with neuroscientist Dr. Cheryl Olman, associate professor in the University of Minnesota’s psychology department, about her work to better understand how the brain processes visual information using sophisticated fMRI techniques, including studying the brains of people with schizophrenia.

Are Jellyfish Smarter Than We Think?

Jellyfish are known for their graceful, hypnotic movement through the water—and for occasionally stinging swimmers. One thing they’re not known for, however, is intelligence. A study published in the journal Current Biology, however, challenges the idea of the ‘brainless’ jellyfish by showing that at least one species of jelly may be capable of associative learning.

The scientists were studying the Caribbean box jellyfish, which normally lives amongst a forest of tangled mangrove tree roots. In the lab, they painted false roots on the walls of the jellyfish’s tank, and watched to see what happened. At first, the jellies judged the low-contrast gray roots to be far away, and tried to swim through them. After a few collisions with the tank, however, the jellies learned that the false roots were closer than they appeared, and learned to keep their distance.

Dr. Anders Garm, an associate professor of marine biology at the University of Copenhagen in Denmark, joins guest host Dessa to explain the experiment, and what it tells researchers about the connection between the behavior of small groups of neurons and the process of learning.

The Mysteries Of Freshwater Jellyfish

In 1933, a high schooler fishing along the Huron River in Ann Arbor, Michigan looked into the water and saw something weird. It turned out to be a freshwater jellyfish – the first ever discovered in the Great Lakes region. Later that year, there was another sighting in Lake Erie.

Researchers think the species hitched a ride here on aquatic plants shipped from China, then spread. But there’s no evidence they harm the lake ecosystems they now call home.

Since then, the jellyfish have spread across the Upper Midwest, loitering mostly in inland lakes, rivers, and streams. But we still don’t know all that much about them.

A biology professor and her field research class at Eastern Michigan University are hoping to change that. Every week, they slap on masks, snorkels, and floaties, and wade out into a southeast Michigan lake on the lookout for jellyfish.

Read the rest at sciencefriday.com.

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Transcripts for each segment will be available the week after the show airs on sciencefriday.com.