using your own type data used to make the system, to test your own system

you need an external souce of data, to use this methodology.

What data we need here to fix the issue?

I am curious how the process of selecting (datapoints) signals looked like and what reasoning stand behind it? How emotional body and face expressions turn into indicator for cognitive funtcions which from science point of view are not confirmed and described? I know signals have explanations but I can’t see direct connections. Maybe there is explanation I didn’t found yet. It’s looks like we have an assumtion “this is it and we will work with this”.