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Imagined speech (silent speech or covert speech) is thinking in the form of sound – “hearing” one’s own voice silently to oneself, without the intentional movement of any extremities such as the lips, tongue, or hands.〔Brigham, K.; Vijaya Kumar, B.V.K., "(Imagined Speech Classification with EEG Signals for Silent Communication: A Preliminary Investigation into Synthetic Telepathy )", June 2010〕 Logically, ''imagined speech'' has been possible since the emergence of language, however, the phenomenon is most associated with the signal processing〔Brigham, K.; Vijaya Kumar, B.V.K., "(Subject Identification from Electroencephalogram (EEG) Signals During Imagined Speech )", September 2010.〕 and detection within electroencephalograph (EEG) data〔A. Porbadnigk; M. Wester; Schultz, T., "(EEG-Based Speech Recognition: Impact of Temporal Effects )", 2009.〕 as well as data obtained using alternative non-invasive, brain–computer interface (BCI) devices.〔Robert Bogue, "(Brain-computer interfaces: control by thought )" Industrial Robot: An International Journal, Vol. 37 Iss: 2, pp.126 – 132, 2010〕 ==History== In 2008, the US Defense Advanced Research Projects Agency (DARPA) provided a $4 million grant to the University of California (Irvine), with the intent of providing a foundation for synthetic telepathy. According to DARPA, the project “will allow user-to-user communication on the battlefield without the use of vocalized speech through neural signals analysis. The brain generates word-specific signals prior to sending electrical impulses to the vocal cords. These ''imagined speech'' signals would be analyzed and translated into distinct words allowing covert person-to-person communication.”〔 DARPA's program outline has three major goals:〔 : * To attempt to identify EEG patterns unique to individual words : * To ensure these patterns are common to different users to avoid extensive device training : * To construct a prototype that would decode the signals and transmit them over a limited range 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Imagined speech」の詳細全文を読む スポンサード リンク
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