Pr. Darke et al., ACCURACY MOTIVATION, CONSENSUS INFORMATION, AND THE LAW OF LARGE NUMBERS - EFFECTS ON ATTITUDE JUDGMENT IN THE ABSENCE OF ARGUMENTATION, Personality & social psychology bulletin, 24(11), 1998, pp. 1205-1215
This study examined the influence of majority opinion on attitudes in
the absence of persuasive argumentation. Participants who were either
high or low in accuracy motivation were presented with an opinion poll
that conveyed consensus information and the Sample size Of the poll.
According to the law of large numbers (LLN), large polls provide more
reliable estimates of consensus than smaller polls. Results generally
supported predictions. Less-motivated participants tended to be influe
nced by consensus regardless of poll size, whereas highly motivated pa
rticipants based attitudes on this information only if the poll was re
liably large. Thus, participants who were highly motivated seemed to a
ppreciate the LLN when making their attitude judgments. Consistent wit
h the heuristic-systematic model, process measures indicated that cons
ensus influenced attitudes through both heuristic and biased systemati
c processing under high motivation, but it influenced attitudes only v
ia heuristic processing when motivation was low.