Three experiments tested the general hypothesis that values are cultur
al truisms-that is, beliefs that are widely shared and rarely question
ed. Experiment 1 examined specifically whether people lack cognitive s
upport for their values. It was predicted and found that analyzing one
's reasons for particular values caused the values to change, a findin
g that would be expected only if individuals lack cognitive support fo
r their values. Experiment 2 verified that analyzing reasons caused va
lue change only when participants were not provided with cognitive sup
port for their values. Experiment 3 found that the effect of analyzing
reasons generalized across a range of individual-differences variable
s. Experiment 3 also showed that analyzing reasons resulted in value r
atings that were less predictive of relevant attitudes than pre-reason
s-analysis value ratings, but only for high self-monitors.