When this occurs, actual physical damage can occur to the brain tissue. I have seen brain scans where certain parts of the brain do not carry much nerve signal due to severe head of neck injury.
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The brain can suffer from:

• Decreased blood flow – injured arteries and veins
• Nerve damage – nerves get compressed and inflamed
• Internal cranial pressure⠀⠀⠀⠀⠀⠀⠀⠀⠀

To build back the tissue I commonly suggest essential fatty acids (EFA’s) and Phosphatidylcholine.
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Choline is naturally found in meats, eggs, dairy, fish, peanuts, soy, and animal organs.
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It is a constituent of lecithin, which most commonly is referred to as soy lecithin. It is a nutrient that is used in brain health and increased nerve signals.
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It makes up:

• Neurotransmitters (nerve transmission chemicals)
• Nerve cell walls (phospholipids)
• Lipid transport (carries out old cholesterol)
• Methyl Donor (MTHFR Support)

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Phosphatidylcholine is a good source of choline if you are sensitive or allergic to any of the foods mentioned.
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Giving your brain the actual parts to help build back brain tissue is something I encourage if you have ever had: concussions, head injuries, family history of mental conditions, blackouts, chronic infections, and strokes.