If I could be a professional musician I guess I could be one of those professional Game Players! Well, neither one of those will happen. If I "have" to do something, then that takes the fun out of it for me.
As for brain activity, they can see changes in the way the brain functions using PET scans (or whatever the acronym is) when the person is engaging in the activity or abstaining from it. There is a big difference between gaining pleasure from an activity (or lack of pleasure when abstaining from the activity) and abnormal brain functionality due to the abstaining from the activity. My brain may show pleasure when I engage in the activity and return to normal when I cease. But if my brain does not return to normal when I am not engaging in the activity, then I believe that points to a serious issue with that activity.
Thank you for replying to my post!