US Patent 7633527 Attention detection

An attention detection system comprises a portable attention detection module for receiving attention clues of a host person. The attention clues are generated from a self perspective of the host. Attention clues of the host person generated from an observer perspective are received. A sensor device generates signals relating to the attention clue signals of the self perspective. At least one sensor generates signals relating to the attention clue signals of the observer perspective. The attention detection module determines a situation of raised attention of the host wearer from the self perspective attention clues and the received observer perspective attention clues.