Why use multiple markers?
For our dog to select the appropriate behavior for a given cue or context, their brain needs to have established associations among sensory stimuli, selected behaviors, and rewards. In training scenarios, typically the rewards are treats, toys, personal play, or a behavior the dog enjoys, and we associate these with the specific behavior/s we desire.
One part of the brain plays an important role in learning such stimulus-action-reward (antecedent-behavior-consequence) associations. However, another part of the brain is focused on reward-prediction error.
So, what is reward prediction error (RPE)?