> The effect is statistical not psychological. It is, though. This article says that if people are bad at estimating their skill (towards randomness / the midp

> The effect is statistical not psychological. It is, though. This article says that if people are bad at estimating their skill (towards randomness / the midpoint), then bad people will overestimate, and good people will underestimate. The psychological part is that people indeed will assume they're closer to the mean than they actually are. DK effect would not be seen if people correctly estimated their skill, nor if experts overestimated, nor if the incompetent underestimated.