AbstractStudied the behaviour of subjects in a ‘normalization’ experiment: when a consistent confederate adopts the subject's norms (adoption situation); when the consistent response of the confederate deviates from the subject's norm (distance situation). We had three conditions for each of these two modes of response: we manipulated the C's image (C was always similar to the subject), and the image of a reference population: C and S were both either very similar (C and S in the majority) or very dissimilar (C and S in the minority) to the population. Or there was no image manipulation.Sixty male subjects participated in this experiment: 10 subjects in each of the six experimental conditions.In two adoption conditions (no image, C and S in the majority) the subjects changed their responses when the confederate adopted their norm. Our hypothesis on the resistance to influence in one of the distance condition (C and S in the minority) was not verified.Thus we have shown that a phenomenon of differential dissimilation exists, but our previous results on differential assimilation are not replicated. These results are coherent with the social differentiation and originality theory which stresses the quest for social identity and distinctiveness by actors who do not ‘react’ but who, in certains situations, elaborate str