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Home NEWS Science News Biology

How a mouse’s brain bends time

Bioengineer by Bioengineer
January 30, 2024
in Biology
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Life has a challenging tempo. Sometimes, it moves faster or slower than we’d like. Nevertheless, we adapt. We pick up the rhythm of conversations. We keep pace with the crowd walking a city sidewalk. 

Alston's singing mouse

Credit: Banerjee lab/Cold Spring Harbor Laboratory

Life has a challenging tempo. Sometimes, it moves faster or slower than we’d like. Nevertheless, we adapt. We pick up the rhythm of conversations. We keep pace with the crowd walking a city sidewalk. 

“There are many instances where we have to do the same action but at different tempos. So the question is, how does the brain do it,” says Cold Spring Harbor Laboratory Assistant Professor Arkarup Banerjee. 

Now, Banerjee and collaborators have uncovered a new clue that suggests the brain bends our processing of time to suit our needs. And it’s partly thanks to a noisy critter from Costa Rica named Alston’s singing mouse.

This special breed is known for its human-audible vocalizations, which last several seconds. One mouse will sing out a longing cry, and another will respond with a tune of its own. Notably, the song varies in length and speed. Banerjee and his team looked to determine how neural circuits in the mice’s brains govern their song’s tempo.

The researchers pretended to engage in duets with the mice while analyzing a region of their brains called the orofacial motor cortex (OMC). They recorded neurons’ activity over many weeks. They then looked for differences among songs with distinct durations and tempos.

They found that OMC neurons engage in a process called temporal scaling. “Instead of encoding absolute time like a clock, the neurons track something like relative time,” Banerjee explains. “They actually slow down or speed up the interval. So, it’s not like one or two seconds, but 10%, 20%.”

The discovery offers new insight into how the brain generates vocal communication. But Banerjee suspects its implications go beyond language or music. It might help explain how time is computed in other parts of the brain, allowing us to adjust various behaviors accordingly. And that might tell us more about how our beautifully complex brains work. 

“It’s this three-pound block of flesh that allows you to do everything from reading a book to sending people to the moon,” says Banerjee. “It provides us with flexibility. We can change on the fly. We adapt. We learn. If everything was a stimulus-response, with no opportunity for learning, nothing that changes, no long-term goals, we wouldn’t need a brain. We believe the cortex exists to add flexibility to behavior.”

In other words, it helps make us who we are. Banerjee’s discovery may bring science closer to understanding how our brains enable us to interact with the world. The possible implications for technology, education, and therapy are as unlimited as our imagination.



Journal

Nature Neuroscience

DOI

10.1038/s41593-023-01556-5

Article Publication Date

30-Jan-2024

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