I am not a rocket scientist by any far stretch of the imagination, but you are decades behind my theory of motivation, which you call arousal. I didn't really understand what you have discovered, and I suspect that it really didn't amount to a momentous revelation. But I know what motivates me, and I did it without all your mind blowing research and technology and PHDs and scientific hypothesis, etc....
For the past thirty years, I have found time and time again, in every situation and example, that for me, and I suspect(you can do all the highbrow experiments, use lots of multisyllable words, and make use of all the latest expensive technology) most people, are going to find themselves motivated, eager, and energized to do things that produce a helpful and charitable or beneficial result for somebody perceived as less fortunate than themselves. In other words, the feeling we get from helping others is a great thing to look forward to. I suggest you try it sometime. By the way, this is actually a suggestion, or more accurately, a well known fact for over two thousand years, with such documentation as "it is more blessed to give than to receive" and "do unto others as you would have them do unto you" and many other very much advanced-far-beyond modern science that you can research for yourselves, I am sure you can figure out where these come from, after all, you are scientists.