>they also suggest our tendencies get stronger over time. The more we write, the more our habits become ingrained.
Not really a surprising/revolutionary conclusion, IMHO.
As a side note, this other experiment is interesting, what happens when you are asked to draw a "common enough" (i.e. something everyone has seen and used) and simple (yet more complex than a circle) object, like a bycicle? A designer/artist asked people to draw a bycicle and then 3-d rendered the sketch, Velocipedia: