Abstract
In this paper, we discuss about “pleasant interaction with computational systems”. Correspondence differs between a user in front of a computer and a user in front of a human being. We argue that this “correspondence difference” needs to be addressed in order to design systems that keep the user's interest. To discuss pleasant interaction, we conducted some psychological experiments using a word tennis game. In this paper, we report the following. (a) Even though the information that a user receives is identical, the user's cognitive appraisal changes whether the user is in front of a computer or a human being. (b) When time passes, the corresponding difference of the user increases, at least in some cases. (c) Even if a program simulated a human being extensively, the change occurs.
