Abstract
The influence of others on one's own actions has been clarified (e.g., Sebanz et al., 2003). The basis of this phenomenon is the formation of co-representations of other people's tasks. We investigated the effect of task-sharing on the memory encoding by correcting the procedural shortcomings of our previous study. A word category judgment task was conducted in an individual condition where participants performed the task alone, and in a joint condition in which they performed the task with a partner. In a subsequent surprise recall task, participants were required to recall all words presented on the screen regardless of category or social conditions. The results showed that the advantage in recall of partner-category over non-assigned category was observed only in the joint condition. This suggested the formation of co-presentations in task-sharing, and the possibility that encoding for the other category is done in the same way as for the self-category.
