Scientists have discovered a group of brain cells that play a key role in keeping people motivated to pursue goals. The research was conducted on rats and focused on a type of neuron called orexin neurons. These neurons are found in a part of the brain that controls sleep, appetite, and energy use.
Previous studies suggested these neurons might also be involved in motivation, but the exact role was unclear. To better understand how these neurons work, scientists created special rats with modified genes. This allowed them to target and change the activity of orexin neurons in a precise way.
In one test, researchers activated the neurons and then had rats press a lever to get food rewards. They measured how many times the rats pressed before giving up, known as the breakpoint. When the neurons were activated, the rats pressed more times before quitting.
In contrast, when the neurons were damaged, the rats gave up more quickly. Scientists also watched how the neurons behaved in real time while the rats waited for food. They found that the neurons became more active when the rats expected a reward.
Activity dropped after the food was given, but stayed high when no reward came. The more effort the rats had to put in, the stronger the neuron activity became. When scientists tried to stop the neurons from working during the wait for a reward, motivation dropped.
But stimulating the neurons at that same time did not make the rats work harder. This suggests that the neurons are needed to keep motivation going, but they can’t boost it beyond normal levels. The results may help explain why people lose motivation in conditions like depression or ADHD.
The findings could lead to new treatments for disorders where motivation is low. Future studies will look deeper into how these brain cells connect to other parts of the brain. Understanding this process could help scientists develop better ways to treat motivational problems.
IMAGE: andreas_danang_a / Pixabay
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