A temporary form of amnesia where a corporate employee retains no knowledge of previous conversations (particularly when involving benefits to underlings).
Most often seeing in managerial types, or those working in a corporate environment for a very long time.
Bob: "Remember in the meeting last week when my boss said I would be in charge of that new project? Well, I noticed Carl working on it, and when I spoke to my boss, she denied ever speaking to me about it."
Jane: "See-- it's that corporate dementia kicking in again."
Rick: "Dude, my boss just told me the exact same thing he said an hour ago-- must be that corporate dementia."