How does (neuro)science characterize "confusion" that occur to "healthy" persons when engaged on a particular mentally-intensive task?
I would exclude the case where we are rationally and with clear arguments deciding one out of many choices (but remain undecided due to lack of sufficient resource/information). My thinking is more towards the case where, for example, we are trying to understand a mathematical problem and its solution, or an abstract reasoning, but in the process get lost: even have no clear idea of what part is 'not understood', or where to start learning (the parts involved) so that we can understand the original problem.
I am aware that I am unable to make my question very clear, I am actually confused how to formulate my thoughts.