Delayed Auditory Feedback

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Delayed Auditory Feedback (DAF) is a device that enables a user of the device to speak into a microphone and then hear his or her voice in headphones a fraction of a second later. Some DAF devices are hardware; DAF computer software is also available.

DAF usage (with a 175 millisecond delay) has been shown to induce mental stress.[1]

Electronic fluency devices use delayed auditory feedback and have been used as a technique to aid with stuttering.

Delayed auditory feedback devices are used for example in speech perception experiments, in order to demonstrate the importance of auditory feedback in speech perception as well as in speech production.[2]

Delayed auditory feedback has been used with a directional microphone and speaker to create a device[3] intended to silence an individual speaker using the mental stress induced in people not used to the effect.[4]

There are now also different mobile apps available that use DAF in phone calls.


  1. ^ Badian, M.; et al. (1979). "Standardized mental stress in healthy volunteers induced by delayed auditory feedback (DAF)". European Journal of Clinical Pharmacology 16 (3): 171–6. doi:10.1007/BF00562057. PMID 499316. 
  2. ^ Perkell, J.; et al. (1997). "Speech Motor Control: Acoustic Goals, Saturation Effects, Auditory Feedback and Internal Models". Speech Communication 22 (2–3): 227–250. doi:10.1016/S0167-6393(97)00026-5. 
  3. ^ Dydymus, J. T. (3 March 2012). "Japanese develop 'SpeechJammer' gun". Digital Journal. Retrieved 3 March 2012. 
  4. ^ Kurihara, K; Tsukada, K. (2012). "SpeechJammer: A System Utilizing Artificial Speech Disturbance with Delayed Auditory Feedback". arXiv:1202.6106 [cs.HC].