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Human echolocation using click trains and continuous noise

In English

Författare

  • Bo N. Schenkman
  • Mats E. Nilsson
  • Nedelko Grbic

Summary, in English

Blind people may detect objects from the information in reflected sounds, echolocation. Detection as a function of the number of clicks compared to a continuous noise was tested by presenting clicks of 5 ms with rates from 1 to 64 clicks during a 500 ms period and a 500-ms continuous white noise. The sounds were recorded in an ordinary room through an artificial binaural head. The reflecting object was an aluminum disk, diameter 0.5 m, at distances of 1 and 1.5 m. These sounds were later presented to 3 blind and 16 sighted participants in a laboratory using a 2AFC methodology. The task was to detect which of the two sounds that contained a reflecting object. Feedback was provided. The blind participants had a higher detection than the sighted, but there were also differences among the blind. These results are put in relation to physical features such as the autocorrelation function and spectral variations.

Publiceringsår

2011

Språk

Svenska

Sidor

13-18

Publikation/Tidskrift/Serie

Proceedings of the 27th Annual Meeting of the International Society for Psychophysics

Volym

27

Dokumenttyp

Konferensbidrag

Ämne

  • Signal Processing
  • Applied Psychology

Conference name

27th Annual Meeting of the International Society for Psychophysics

Conference date

2011-10-24 - 2011-10-27

Conference place

Herzliya, Israel

Status

Published