From Trading in the Zone:
Addiction to Random Rewards
Several studies have been done on the psychological effects of random rewards on monkeys.
For example, if you teach a monkey to do a task and consistently reward it every time the task is done,
the monkey quickly learns to associate a specific outcome with the efforts.
If you stop rewarding it for doing the task, within a very short period of time the monkey will simply stop doing the task.
It won't waste its energy doing something that it has now learned it won't be rewarded for.
However, the monkey's response to being cut off from the reward is very different if you start out on a purely random schedule, instead of a consistent one.
When you stop offering the reward, there's no way the monkey can know that it will never be rewarded again for doing that task.
Every time it was rewarded in the past, the reward came as a surprise.
As a result, from the monkey's perspective, there's no reason to quit doing the task.
The monkey keeps on doing the task, even without being rewarded for doing it.
Some will continue indefinitely.
Addiction to Random Rewards
Several studies have been done on the psychological effects of random rewards on monkeys.
For example, if you teach a monkey to do a task and consistently reward it every time the task is done,
the monkey quickly learns to associate a specific outcome with the efforts.
If you stop rewarding it for doing the task, within a very short period of time the monkey will simply stop doing the task.
It won't waste its energy doing something that it has now learned it won't be rewarded for.
However, the monkey's response to being cut off from the reward is very different if you start out on a purely random schedule, instead of a consistent one.
When you stop offering the reward, there's no way the monkey can know that it will never be rewarded again for doing that task.
Every time it was rewarded in the past, the reward came as a surprise.
As a result, from the monkey's perspective, there's no reason to quit doing the task.
The monkey keeps on doing the task, even without being rewarded for doing it.
Some will continue indefinitely.
