A typical psychology article contains 3 to 9 self-citations, depending on the length of the reference list (10% of all citations). In contrast, cited colleagues rarely receive more than 3 citations. This is what we call the self-citation bias: the preference researchers have to refer to their own work when they guide readers to the relevant literature. We argue that this finding is difficult to understand within the traditional, science-based view, which says that reference lists are there to help the reader. It is more easily understood within a social view of reference lists which argues that scientists form groups and that reference lists partly reflect well-known phenomena in social psychology and group dynamics. Within this view, the self-citation bias is a self-serving bias motivated by self-enhancement and self-promotion.
The self-citation bias in psychological scienceScientific publications are a never-ending source of inspiration, not only due to the information they contain but also because of the formal characteristics they adhere to. In particular the reference lists have been scrutinised recently with some quite remarkable findings. Below we summarise first the available evidence and we look then more specifically at the number of self-citations in journal articles and the reasons why authors cite themselves.
The traditional, science-based view of reference listsReaders of scientific articles expect an article's reference list to comprise information about the publications they need for a good understanding of the article's contribution to the field (i.e., the cumulative nature of science) and for a replication of the reported studies if they wish to do so (i.e., the replicability of the findings). From this perspective, reference lists are at the readers' service, to help them find critical information. We will call this the traditional, science-based view of reference lists.