Further on...

Timothy Ferris points out in "The Whole Shebang" that often people consider the "indeterminacy principle" as representing the difficulty of accurately measuring the locations and trajectories of particles, but "the point is not that it is hard to find out just where, say an electron is, but that the electron has no exact location. Depending on how it is measured, an electron can look specifically as a pinpoint or as vague as a cumulus cloud."
Furthermore, relating this concept to the Quantum Zeno effect, we know that it is impossible to separate the observer from the thing observed - they are one and the same system. If observed continuously, an unstable elementary particle would never decay...
In the same way, since the brain is a quantum system, focusing on a given idea holds its pattern of connecting neurons in place and the idea does not decay as it would if it were ignored.
Ironically, the action of holding an idea in place is truly a decision you make, leading to the Stapp and Schwartz "Decision Model" based on the VonNeuman interpretation of Quantum physics that "a particle only probably exists in one position or another and that measurement causes a 'Quantum collapse' where the experimenter has chosen a position for the particle, thus ruling out other positions."
Interestingly, Stapp and Schwartz modeled free will from this concept and claimed it to be analagous to thought processes. Attending to or "measuring" a thought holds it in place and "collapses" the probabilities on one position. The model assumes the existence of a mind that chooses the subject of attention, parallel to the quantum collapse that assumes the existence of an experimenter who chooses the point of a measurement.

I found this theory to be interesting, but not conclusive in itself, yet postulating the mechanism for thought processes between the mind and brain is a fascinating subject...the compelling evidence for a non-material mind separate from the brain presented in "The Spiritual Brain" convinced me of the mind's metaphysical identity and its interactions with and surprising power over the physical brain.
It is so ironic that while scientists with a materialist view of reality cannot fathom anything outside of the brain, in reality, the majority of people in the world operate assuming the existence of a free-will, "choice," and the truth of the power of the mind's belief overcoming the circumstances. Perhaps a broad generalization, but the simple "mind over matter" saying is nothing new and in fact quite a simple concept that did not necessitate the discovery of Quantum physics to divulge.
It amuses me when scientists conclude what the common man has known all along...