A model of the mind-brain relationship is developed in which novel biophysical principles in brain function generate a dynamic possessing attributes consistent with consciousness and free-will. The model invokes a fractal link between neurodynamical chaos and quantum uncertainty. Transactional wave collapse allows this link to be utilized predictively by the excitable cell, in a way which bypasses and complements formal computation. The formal unpredictability of the model allows mind to interact upon the brain, the predictivity of consciousness in survival strategies being selected as a trait by organismic evolution.