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Increased emission intensity can compensate for the presence of noise in human click-based echolocation.

Castillo-Serrano, J. G. and Norman, L. J. and Foresteire, D. and Thaler, L. (2021) 'Increased emission intensity can compensate for the presence of noise in human click-based echolocation.', Scientific reports., 11 (1).


Echolocating bats adapt their emissions to succeed in noisy environments. In the present study we investigated if echolocating humans can detect a sound-refecting surface in the presence of noise and if intensity of echolocation emissions (i.e. clicks) changes in a systematic pattern. We tested people who were blind and had experience in echolocation, as well as blind and sighted people who had no experience in echolocation prior to the study. We used an echo-detection paradigm where participants listened to binaural recordings of echolocation sounds (i.e. they did not make their own click emissions), and where intensity of emissions and echoes changed adaptively based on participant performance (intensity of echoes was yoked to intensity of emissions). We found that emission intensity had to systematically increase to compensate for weaker echoes relative to background noise. In fact, emission intensity increased so that spectral power of echoes exceeded spectral power of noise by 12 dB in 4-kHz and 5-kHz frequency bands. The efects were the same across all participant groups, suggesting that this efect occurs independently of long-time experience with echolocation. Our fndings demonstrate for the frst time that people can echolocate in the presence of noise and suggest that one potential strategy to deal with noise is to increase emission intensity to maintain signal-to-noise ratio of certain spectral components of the echoes.

Item Type:Article
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Available under License - Creative Commons Attribution 4.0.
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Date accepted:04 January 2021
Date deposited:25 February 2021
Date of first online publication:18 January 2021
Date first made open access:25 February 2021

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