An absence of stimulation is not a neutral state. It is an aversive signal that demands action, and the fastest available action is the one already practised.
Novice
The hidden part#0318
An empty interval is not neutral. It generates pressure to act, and the practised routine is the cheapest action available.
A remembered episode is not the sum of its moments. It is reconstructed from a peak and an ending, which is why how something finished governs whether it repeats.
Adept
The hidden part#0317
Adding an easy final stretch can make a harder session preferable. The summary is built from the end, not from the total.