Now account for the moment in which you'decided' that your favorite ice-cream is vanilla (or hot chocofudge, or whatever).
A'decision' which does not take place as part of a process of consciousness cannot be described as a decision. It can be described as a 'passion', as a 'movement within the soul', as a 'process within the unconscious mind'. But not a decision. Decisions are the product of congeries of systems, these congeries usually being described as 'individuals'. And individuals do not 'decide' what their passions are to be.