Contrary to the ideal, experimental evidence shows that listeners form the following prediction programs: (von Hippel, 2001)
- Pitch Proximity.
Expect an ensuing pitch to be near the current pitch.
- Step-Inertia.
Listeners expect a small interval to be followed by a subsequent small interval in the same direction.
- Post-skip Reversal.
Listeners expect a large interval to be followed by a change of direction.