At least provide a summary. I mean, "After completing his medical studies, Friston moved to Oxford and spent two years as a resident trainee at a Victorian-era hospital called Littlemore. Founded under the 1845 Lunacy Act, Littlemore had originally been instituted to help transfer all “pauper lunatics” from workhouses to hospitals. By the mid-1980s, when Friston arrived, it was one of the last of the old asylums on the outskirts of England’s cities."

is a story.

But as a neuroscientist with an interest in machine learning, I want to know the idea, not the history of Littlemore, attended by this scientist whose tools and methods I have used(Friston motion parameters, I am looking at you).

In that case the wikipedia article is probably a decent starting point to see whether you are interested or not: https://en.wikipedia.org/wiki/Free_energy_principle

I'd agree but the "free energy principle" is first mentioned a good 1,000+ words into the article.