Henri's classmate told him that he didn't appear nervous at all—while Henri had been sure the audience could see his hands shaking. Henri's experience illustrates the illusion of transparency.
People often exaggerate how much others know about their personal mental state due to the illusion of transparency. The propensity for people to overestimate their capacity to comprehend the personal mental states of others is one example of the illusion of transparency (also known as the observer's illusion of transparency). The illusion of asymmetric insight and this cognitive bias are related.
Two experiments on public speaking anxiety in relation to the illusion of transparency were conducted by Kenneth Savitsky and Thomas Gilovich. The first was concerned with how anxious a speaker perceived themselves to be compared to how anxious an observer perceived them. The findings confirmed expectations: the speaker was harsher on themselves than the observer was.
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