Why do people check their phones even when they expect no messages?
Unpredictable rewards keep attention alive longer than predictable ones.
Most checks reveal nothing.
That is exactly why the next one feels important.
The hidden mechanism is variable reward.
Humans pay close attention to unpredictable outcomes.
A message might arrive.
A surprise might appear.
The possibility becomes habit.
People think they are checking information.
Very often, they are checking hope.
