Addendum to the essay on Pauseability:
Stimulus leads to the creation of impulse in the brain. The impulse triggers an appropriate reaction which obeys the Darwinian Imperative.
Stimulus is frequently external, and out of our control. As it triggers impulse, we have a certain degree of control (we can condition our minds to break the chain between stimulus and impulse, but this takes time and effort). Reaction, or the resulting action, of course, is entirely within our control.
Pauseability is about breaking the causal link between these three components.