Q: Why do people stick out their tongues when they're concentrating on a task?The reason has to do with the way the brain coordinates attention, movement, and muscle control.
🧠 1. The brain's movements overlap
Your tongue is controlled by a network of nerves and brain regions involved in movement. Interestingly, some of the brain systems that control your tongue and mouth are closely connected to those involved in controlling your hands.
When you're performing a task that requires precise movements, such as threading a needle or assembling a small object, your brain is coordinating several processes simultaneously.
Researchers believe that sticking out your tongue may be an unintended side effect of these overlapping motor-control systems. In other words, your brain is concentrating so hard on controlling your hands that your tongue gets involved, too!
🎯 2. Concentration can suppress other movements
When you're deeply focused, your brain prioritizes the task at hand. Unnecessary movements may be reduced, while certain automatic movements or habits become more noticeable.
Sticking out your tongue may be one of these behaviours. It can happen without conscious thought, much like frowning when you're trying to solve a difficult problem.
Scientists sometimes refer to this general phenomenon as motor overflow: muscle activity that occurs alongside an intended movement, even though it isn't necessary for the task.
👶 3. Why children do it more often
You've probably noticed this behaviour particularly in young children.
Children are still developing the ability to control their movements independently. Their motor systems are not yet as refined as those of adults, so concentrating on one movement can sometimes trigger activity in other muscles.
For example, a young child learning to write might stick out their tongue, open their mouth, or move their lips while carefully forming letters.
As children mature, their brains become better at separating and coordinating different movements. Consequently, this behaviour often becomes less noticeable, although plenty of adults still do it!
🏓 4. It's not limited to children
Adults may stick out their tongues while performing activities that require precision, timing, or intense concentration.
Examples include:
- Playing a musical instrument.
- Playing video games that require quick reactions.
- Painting or drawing fine details.
- Performing delicate repairs.
- Competing in sports such as tennis or table tennis.
In some activities, mouth movements may also become part of a learned habit. A person might unconsciously make a particular facial expression whenever they concentrate.
🔬 5. What does the science say?
One interesting line of research concerns the relationship between language, mouth movements, and manual actions.
A 2019 study published in Frontiers in Psychology examined how young children used their tongues while performing tasks involving different types of hand movements. The researchers found that tongue activity varied with the demands of the manual task.
This supports the idea that tongue movements and hand movements can be connected through the brain's motor-control systems.
However, scientists haven't established one single explanation for every instance of tongue-sticking. The behaviour likely has several contributing factors, including motor-system overlap, developmental differences, and learned habits.
🤔 So, does sticking out your tongue actually help you concentrate?
Possibly indirectly, but there's no strong evidence that deliberately sticking out your tongue improves concentration.
The behaviour is more likely to be a by-product of the brain coordinating complex movements than a special technique that makes you think better.
It's a little like watching someone lean forward while trying to hear something difficult. The movement might accompany the effort, but that doesn't necessarily mean it improves the performance.
The fascinating takeaway: Your brain doesn't always control every muscle independently. When you're intensely focused on a task, movements that seem completely unrelated can emerge because the neural systems controlling them overlap.
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