How does practice actually improve reaction time? What is actually going in the brain?

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How does practice actually improve reaction time? What is actually going in the brain?

In: Biology
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Before practise: Brain makes many calculations, each of which add to total reaction time, to perform task.

After practise: Brain has created automatic systems to handle calculations, no longer must actively perform these calculations, so reaction time is not as long.

As you learn to do a thing, your brain is making connections between neurons (brain cells). As you practice the thing, those connections get coated in a sheath of material called myelin. Myelinated connections carry the impulse faster.

The simple way I’ve understood it:
Every task requires a specific neural pathway in your brain.
We have many of these in our brain already for every day tasks.
A new task will create a new pathway which over time will as the pathway is triggered over and over it will become reinforced and permanent.