I'm not positive about direct stimulation, however, I do know most addiction models based on rats in solitary confinement have done more to prove the damage of solitary confinement rather than addiction. 

...in those experiments, iirc, they only work in contrived settings. If you put a rat in its natural environment, with places to run and explore and eat etc they _don't_ do that, right?

denlillaapan

 studies to find an answer, at least with rats.

Rats will perform lever-pressing at rates of several thousand responses per hour for days in exchange for direct electrical stimulation of the lateral hypothalamus.[14] Multiple studies have demonstrated that rats will perform reinforced behaviors at the exclusion of all other behaviors. Experiments have shown rats will forgo food to the point of starvation

Our phones have become the dopamine lever. The same psychology that casinos use to keep a gambler sitting at a slot machine is being used by every app you use.

I'm absolutely 100% positive that we (or maybe somone else) is/are training our brains.

AskSN

Do We Train Our Attention Span?

You really only need to look at [Brain stimulation reward](https://en.m.wikipedia.org/wiki/Brain_stimulation_reward#Strength_of_drive) studies to find an answer, at least with rats. 

>Rats will perform lever-pressing at rates of several thousand responses per hour for days in exchange for direct electrical stimulation of the lateral hypothalamus.[14] Multiple studies have demonstrated that rats will perform reinforced behaviors at the exclusion of all other behaviors. Experiments have shown rats will forgo food to the point of starvation

Our phones have become the dopamine lever. The same psychology that casinos use to keep a gambler sitting at a slot machine is being used by every app you use. 

I'm absolutely 100% positive that we (or maybe somone else) is/are training our brains. 

