> It's easier to understand, when you understand the concept of
> differential equations. In general you want to map a certain time
> point t on a neural (or hemodynamic) activation level x. However, for
> such dynamic systems this mapping is hard to define. It is much easier
> to describe, how x changes from time point t to (t + dt). The neural
> model of DCM describes exactly that. A value of 1.7 in the B matrix
> increases just the first derivative of x by 1.7 * u.
it is 1.7 * u * x, to be more precise
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