Abstract
In a letter to the publisher of the Journal of the Acoustical Society of America, Lee (1950) was the first to call attention to a method meant to delay the process of perceiving one’s own speech (delayed auditory feedback: DAF) and to report on the first investigations of this field of research, which nowadays may be placed in the overlapping sphere between linguistics, psychology, and physiology, between audiology and logopedics. Lee used a tape recorder with separated recording and playback heads, recorded the speech produced by his subjects on tape via the recording head, reproduced the speech just recorded via the playback head, and played it to the speaker via head receivers. By means of the experimental equipment the speaker thus hears his own speech delayed by periods of approximately 50–800 ms in comparison to moment of production of speech, depending on the running speed of the tape recorder and the distance of the sound heads (cf. Rock 1977).
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