"We tend to treat our own introspections as something of a gold standard in assessing...whether judgments have been tainted by bias. By contrast we treat the introspections of other actors as merely another source of plausible hypothesis – to be accepted or rejected as a function of their plausibility in light of what we know.... We refer to this asymmetry as the introspection illusion because the faith people have in the validity of their own introspections is misplaced. Although people cannot report accurately on the contents of their thoughts...the psychological processes and the true determinants of their behavior are often inaccessible to introspection."
January 1, 1970
https://en.wikiquote.org/wiki/Introspection