Earlier quoted context omitted.
I agree with your ultimate conclusion ("Using a computer is not a drug"), and that this is an important consideration, but to play with the forest-trees thing here, the stimulus I think most people perceive and/or conditioned to is the alert tone and/or vibration, which I believe has been argued to (not in their words) have some inherent salience, once the user is conditioned by carrying a phone around for a while, a…
If you want to argue this then at least use the correct description of the proximal cause, "hits of glutamate in the shell of the nucleus accumbens and ventral tegmental area". It doesn't roll off the tongue and focusing on the neurochemistry ignores the context. So maybe it's better to just say it simply, "If you enjoy doing an enjoyable thing and you do it a lot you'll anticipate liking it more than reality provide…
Re: U.S. workers have gotten less productive – no one is sure why
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