CONF Sheikhi_ICMI_2012/IDIAP Investigating the Midline Effect for Visual Focus of Attention Recognition Sheikhi, Samira Odobez, Jean-Marc focus of attention Gaze HCI HRI EXTERNAL http://publications.idiap.ch/attachments/papers/2012/Sheikhi_ICMI_2012.pdf PUBLIC Int Conf. on Multimodal Interaction (ICMI), Santa Monica 2012