p561fig15.32 The SNc can generate both dopamine bursts and dips in response to rewards whose amplitude is unexpectedly large or small.<BR>||  Inhibitory pathway: expectation <I>magnitude</i>.  1. If reward is greater than expected, a dopamine burst causes striosomal expectation to increase.  2. If reward is less than expected, a dopamine dip causes striosomal expectation to decrease.  3. This is a negative feedback control system for learning.  Conditioned stimuli (CS)-> Striosomal cells <- dopamine | (-)-> SNc->.