Introspection Illusion
A cognitive bias in which people wrongly think they have direct insight into the origins of their mental states, while treating others' introspections as unreliable.
Origin
American psychologist Emily Pronin at Princeton University coined the term in her 2007 paper with Matthew Kugler, "Valuing thoughts, ignoring behavior," in the Journal of Experimental Social Psychology. The work built on a rich lineage: Timothy Wilson and Richard Nisbett's landmark 1977 paper "Telling more than we can know" had shown that people frequently cannot accurately report on their own cognitive processes. Pronin connected this to the bias blind spot — the tendency to see biases in others but not in oneself — which she had identified in 2002.
Everyday Use
You're convinced you chose that job for perfectly rational reasons, while suspecting your friend took theirs because of prestige bias. We trust our own self-reflection as reliable evidence of our motives, but assume other people can't see their own blind spots. The irony is that introspection is equally unreliable for everyone — we just can't see that about ourselves.