Toshiyuki Shiwa Takayuki Kanda Michita Imai Hiroshi Ishiguro Norihiro Hagita How Quickly Should a Communication Robot Respond? Delaying Strategies and Habituation Effects. 141-155 2009 1 I. J. Social Robotics 2 http://dx.doi.org/10.1007/s12369-009-0012-8 db/journals/ijsr/ijsr1.html#ShiwaKIIH09