Each of us has the unfortunate case of being a population sample size of n=1. I think each of us, on some deep level , have met and recognized our own learning

Each of us has the unfortunate case of being a population sample size of n=1. I think each of us, on some deep level , have met and recognized our own learning rates- and not only the linear rate, but derivative- and I agree with you that this rate of change is deeply linked to fluid intelligence