https://www.psychologytoday.com/blog/the-athletes-way/201801/the-neuroscience-proactive-vs-hyper-reactive-thinking

Recently, an international team of researchers identified that robust white matter connectivity between specific brain regions is key to fluid intelligence and thinking proactively. Conversely, the scientists found that hyper-reactive cognitive control processing is linked to anxiety and poor white matter organization. These findings are published in the latest issue of the journal NeuroImage.