Grainger, whilst I would agree that velocity = distance/time, these days the term speed is used to define 'rate(s)'.
My PC CPU has a Speed of 750MHz but it doesn't travel any distance (well I guess not, I am yet to open the box and look whilst it is turned on). What about the measurement of the speed of decay in a radioactive isotope (half-life), no movement required there either.
I suggest speed is better defined as 'a rate of change' in these circumstances; and perhaps that could be applied here with thought, a rate of change of something in the mind.
[ 20 August 2001: Message edited by: Icarus ]