Researchers discovered a group of brain cells in an old part of the brain that helps animals pay attention. These cells work like a filter, letting the brain focus on important information while ignoring the rest.
The study was done with mice at Johns Hopkins University. The findings suggest that a similar system exists in all animals with backbones, including humans. This could lead to better treatments for attention problems.
Ancient Brain Region Linked to Attention
Every day, we sort through many sounds, sights, and ideas. We pick what matters most and ignore the rest. This skill is called selective spatial attention. When it doesn’t work well, it can be part of autism or ADHD.
Scientists used to think the pre‑frontal cortex, a part of the brain that is big in humans, was the main control center for attention. But many animals focus well even without a large pre‑frontal cortex, so there must be another system.
Brainstem Neurons Act as a Focus Filter
The new research shows that a network of tiny inhibitory neurons in the brainstem also guides attention. These neurons are found in fish, birds, and mammals. The idea came from earlier work on birds, frogs, and turtles.
To test the cells, the scientists gave mice a simple game. A screen showed a bright cue straight ahead and a distracting cue on the side. The mouse earned a treat when it reacted to the front cue and ignored the side cue.
The mice did well until the researchers turned off the brainstem neurons for a short time.
"When we inactivate these neurons, the mice become hyper‑distractable," one researcher explained.
Distraction Increases When Neurons Are Disabled
Additional checks proved the mice could still see and move normally. The problem was that they could no longer compare competing signals and choose the most important one.
"The only thing impaired was their ability to take the competing pieces of information, compare them, and pay attention to the location with the most important information," a scientist said. "This part of the brain works like an attentional selection engine. It asks, ‘What is the most important info right now?’"
Potential Implications for ADHD and Autism
The team now wants to see if these neurons work the same way in people. Early evidence suggests they exist in humans, too.
If future studies find that these cells behave differently in ADHD or autism, new medicines could be designed to target them directly.