A modified proportional change model of attitude change by group discussion

The data of two experiments of dyadic group discussion have been reanalysed. An extended proportional change model was designed to explain the actual process of attitude change. The model is deined by two parameters. The irst represents the impact ofsingle pro-arguments and single con-arguments on the attitude or decision preference. The second describes the resistance to further change that increases with the distance from the initial position. It was hypothesized that the irst parameter should be higher and the second lower, with a similar partner than with a dissimilar one. The prediction was conirmed for the irst parameter only. A comparison ofthe extended proportional change model to related models concludes the report. unknown unknown