It actually does cause brain damage. I mentioned it in an essay (What if I paid for all my free software?):

For one, power causes brain damage which renders rich people literally incapable of knowing what is best for others:

“Subjects under the influence of power, he found in studies spanning two decades, acted as if they had suffered a traumatic brain injury—becoming more impulsive, less risk-aware, and, crucially, less adept at seeing things from other people’s point of view.”

“And when he put the heads of the powerful and the not-so-powerful under a transcranial-magnetic-stimulation machine, he found that power, in fact, impairs a specific neural process, “mirroring,” that may be a cornerstone of empathy.” ―Power Causes Brain Damage, by Jerry Useem for The Atlantic.‍[16]