You don't need to go down to cellular or sub-cellular level to see what works and what doesn't. This essay might get this right, but conjectures at higher level

You don't need to go down to cellular or sub-cellular level to see what works and what doesn't. This essay might get this right, but conjectures at higher level may be misleading. At the same time, there has been a good deal of research on how learning works at the level that we can look at and understand: real people learning in different ways, then tested. There's been a research, that I fail to recall where, that when people liked learning, they learned little, while if they did hard tasks and disliked it, in fact they learned the matter far better, than the first group.