This article describes users’ responses to human-like characteristics
of two health promotion IVR systems. We conducted a qualitative evaluation of
two systems that promoted physical activity and healthy dietary behavior
respectively. Two themes that emerged dealt with favorable responses of the
users to the machine’s intrinsic qualities of being insentient and
non-judgmental, and the users’ precarious sensitivity to certain
human-like characteristics of the systems, namely, the content of the scripts
and the recorded human voice. The article suggests that design factors that are
intended to enhance human-like characteristics of these applications elicit both
positive and negative responses. Thus, even though many users enjoyed and
appreciated the human-like performance of the machine, some who were more
sensitive about their exercise or dietary behavior preferred a non-affective
response by these systems, i.e. they preferred the system to behave like a
‘machine’ (without emotions) rather than a ‘person’.