It's called a variable ratio reward schedule [1]. It's at play in slot machines for example. Very effective at getting rapid and persistent responses. [1] http

It's called a variable ratio reward schedule [1]. It's at play in slot machines for example. Very effective at getting rapid and persistent responses. [1] https://en.wikipedia.org/wiki/Reinforcement#Gambling_%E2%80%93_variable_ratio_scheduling https://en.wikipedia.org/wiki/Reinforcement#Gambling_%E2%80%...