Just because it's one of my pet peeves, this is not what Dunning Kruger says. What it says is that people who are poorly skilled in a task will overestimate their skill and those highly skilled will underestimate, but not that the poorly skilled estimate themselves to be better than the highly skilled.
From the wikipedia article you link:
> Among laypeople, the Dunning–Kruger effect is often misunderstood as the claim that people with low intelligence are more confident in their knowledge and skills than people with high intelligence.
My response was directed specifically at the OP's second question, about the "opposite" of impostor syndrome, and not the first one.
The dunning krugger effect is widely regarded as the polar opposite of it:
- "If the Dunning-Kruger effect is being overconfident in one's knowledge or performance, its polar opposite is imposter syndrome or the feeling that one is undeserving of success. People who have imposter syndrome are plagued by self-doubts and constantly feel like frauds who will be unmasked any second." [1]
- "This is the opposite to the Dunning-Kruger effect. The Imposter Syndrome is a cognitive bias where someone is unable to acknowledge their own competence. Even when they may have
multiple successes they struggle to attribute their success to internal factors." [2]
- "The opposite of the Peter Principle and Dunning-Kruger effect is the imposter syndrome. This is when smart, capable people underestimate their (...)" [3]
From the wikipedia article you link:
> Among laypeople, the Dunning–Kruger effect is often misunderstood as the claim that people with low intelligence are more confident in their knowledge and skills than people with high intelligence.