Phd-comics – the one real resource to survive your thesis (and your work in science) – had an outline of the “Thesis repulsor field”. Especially the “periodic productivity” trajectory seems to be of interest when considering scientific productivity. Periods of excessive productivity are short and relate to strong repulsive forces, while the more extended periods of procrastination are in concert with weak forces and therefore are hard to leave. Well, that fits, doesn’t it?
And where we’re at it. Jorges description of the relation between advanced and simple maths skills in students of science is very enlightening as well. And to all the underdocs it may be helpful to know, that your doc-time is really short. You’re basically instantaneous a post-doc.