According to LessWrong, brain implants trigger immune rejection because of a materials mismatch. Rigid electronics inserted into soft neural tissue cause micro-movements with every heartbeat, and the brain interprets this friction as severe infection. The resulting inflammation kills surrounding neurons and creates scar tissue that electrically insulates the electrodes. The solution is to redesign the implant materials—not suppress the immune system. Future electrodes need flexible cushioning, like hydrogels, that match the elasticity of actual brain tissue. When implants bend with the brain instead of against it, they integrate without triggering an immune attack.

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