13. Dopaminergic firing is correlated to the magnitude of the reward. a) positively; as the size of the reward increases, so does the firing rate b) negatively; as the size of the reward increases, the firing rate decreases c) positively and negatively; depending on the type of reward, the firing rate may increase or decrease with an increase in the reward size d) none of the above; there is no correlation between reward magnitude and dopaminergic firing