Control head movement

Hi, I am using Bot Libre for one of the projects to implement http://robotics.usc.edu/~icmi/2012/docs/2012SrinivasanEtAl_ICMI-WS1.pdf. I need to control the head movement (left-right, up-down) of the bot based on the analysis of text, is there any option to control the head movement of the bot.