Social influence and the verifiability of the issue under discussion: Attitudinal versus objective items

Compared majority and minority influence on attitudinal (opinion) vs objective (knowledge) tasks in 2 experiments with a total of 360 adults. The hypothesis that minority influence would decline on objective items was tested by exposing Ss either to a minority or majority influence source; the question under discussion was either objective (from which country does Italy import most of its raw oil?) or attitudinal (from which country should Italy import most of its raw oil?). Exp 1 showed that, compared to a no-influence control group, majorities exerted a reliable influence on both objective and attitudinal issues whereas minorities were persuasive only on attitudinal issues. Exp 2 indicated that this was true only for Ss who were uncertain of their own position, while minorities were unable to convince highly certain Ss regardless of type of task