Gricean stages in the construction of 'strong' freedom (M. Heisenberg)

From informationphilosopher, B. Doyle:

"In 2009, the neurobiologist and geneticist Martin Heisenberg, son of quantum physicist Werner Heisenberg, found evidence for a combination of random and lawful behavior in animals and unicellular bacteria.
Evidence of randomly generated action — action that is distinct from reaction because it does not depend upon external stimuli — can be found in unicellular organisms. Take the way the bacterium Escherichia coli moves. It has a flagellum that can rotate around its longitudinal axis in either direction: one way drives the bacterium forward, the other causes it to tumble at random so that it ends up facing in a new direction ready for the next phase of forward motion. This ‘random walk’ can be modulated by sensory receptors, enabling the bacterium to find food and the right temperature.
In higher organisms, Heisenberg finds that the brain still may include elements that do a random walk among options for action.
As with a bacterium’s locomotion, the activation of behavioural modules is based on the interplay between chance and lawfulness in the brain. Insufficiently equipped, insufficiently informed and short of time, animals have to find a module that is adaptive. Their brains, in a kind of random walk, continuously preactivate, discard and reconfigure their options, and evaluate their possible short-term and long-term consequences.
(Nature, 14 May 2009, p.165)
This is clearly another example of a two-stage model for "free" followed by "will.""