I find it hard to describe the
sensation. It is almost like a head rush - or a chill or tingle - in
my brain; and it is accompanied by memories that usually take a more linguistic form: I remember words being said or written, plus a little about the context. However, within what seems like milliseconds, it dissipates and I cannot remember what the words/memories were. The sensation doesn't happen often, but when it does, there is usually a cluster of them over a few-hour period.