The way i look at is: a baby and an adult's emotions are the same set. Let's assume emotions are the drivers/motivators, the difference between the two is one of nuance and complexity. The adult will refine how they get what they want whereas a young child will just try and take what they want, with no consideration for the consequences or effects on others of their actions. So, increasing consciousness can be one of increasing sensitivity and subtlety, or even deviousness if their intent is completely selfish.
The purported determinism comes from the fact that elements, compounds react in predictable ways in a given set of conditions, and then, determinists extend and extrapolate that to mean that freewill is not possible because at the lower level things are determined.