This is not a human universal - people who put even a small amount of training into calibration can become very well calibrated very quickly. This is a sign that most Less Wrongers continue to neglect the very basics of rationality and are incapable of judging how much evidence they have on a given issue. Veterans of the site do no better than newbies on this measure.

Can someone who's done calibration training comment on whether it really seems to represent the ability to "judge how much evidence you have on a given issue", as opposed to accurately translate brain-based probability estimates in to numerical probability estimates?