Spotlight Effect

Participants wearing a t-shirt they were embarassed by 

Signifcantly overestimated how many observers would notice it

We believe other people notice our appearance and behaviour more than they actually do

See the full study here

Gilovich, T., Medvec, V. H., & Savitsky, K. (2000). The spotlight effect in social judgment: An egocentric bias in estimates of the salience of one’s own actions and appearance. Journal of Personality and Social Psychology, 78(2), 211–222.

Want to know more about biases?

Zero-Sum Bias

Endowment effect

Cheerleader Effect