Neuroscience blog Oscillatory Thoughts has a brilliant meditation on the phenomenology of “writer’s block”.
It includes what I originally thought was an hilarious but mocked-up paper from the Journal of Applied Behavior Analysis, only for me to discover that it was genuinely published.
For those wanting verification of these important findings, Oscillatory Thoughts has a replication of this landmark study using more recent technology.
Link to Oscillatory Thoughts on “writer’s block”.
Link to the full text of the scientific paper.
Mind Hacks 
There’s a replication published in the same journal, 33 years later http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2078566/pdf/jaba-40-04-773.pdf?tool=pmcentrez
I wanted to write a comment, but I couldn’t think what to say……