</ref><ref>Citi, Luca (2009). [https://sites.google.com/a/neurostat.mit.edu/lciti/publications_files/LCitiPhD.pdf?attredirects=1 „Development of a neural interface for the control of a robotic hand]“ (PDF). Scuola Superiore Sant’Anna, Pisa, Italy: IMT Institute for Advanced Studies Lucca: 5. Retrieved 7 June 2014</ref>
При определени обстоятелства компютрите могат да проследяват действията на потребителя и да реагират, без да им се задават специални команди. Експериментира се с различни средства за проследяване на части от тялото: [[сензор]]и, отбелязващи позицията на главата, посоката на погледа и т.н. Това има особено голямо значение при разработването на интерфейси за [[виртуална реалност]].<ref>Jordan, Joel. „Gaze Direction Analysis for the Investigation of Presence in Immersive Virtual Environments“ (Thesis submitted for the degree of Doctor of Philosophy). University of London: Department of Computer Science: 5. Retrieved 7 June 2014. „The aim of this thesis is to investigate the idea that the direction of gaze may be used as a device to detect a sense-of-presence in Immersive Virtual Environments (IVE) in some contexts.“</ref><ref>Ravi (August 2009). „Introduction of HMI“. Retrieved 7 June 2014. „In some circumstance computers might observe the user, and react according to their actions without specific commands. A means of tracking parts of the body is required, and sensors noting the position of the head, direction of gaze and so on have been used experimentally. This is particularly relevant to immersive interfaces.“</ref>
