Self-other similarity judgment asymmetry refers to the tendency of people to judge others to be more similar to themselves than they judge themselves to be similar to others. This effect can be explained with both a cognitive model (Tversky, 1977) and a motivational explanation (Codol, 1987). Recent research has provided initial evidence for the core assumption of the motivational explanation and tested a hypothesis that can only be derived from the motivational explanation. The present study aims to provide further evidence for the motivational explanation by testing another hypothesis derived from it that goes beyond the cognitive model. Our results show that participants with a strong need for uniqueness tended to exhibit self-other asymmetry, but only with respect to attributes that were difficult to falsify.