TY - JOUR T1 - Comparing passive and active hearing: spectral analysis of transient sounds in bats JF - Journal of Experimental Biology Y1 - 2008 A1 - Goerlitz, H. R. A1 - Hubner, M. A1 - Wiegrebe, L. KW - background noise KW - call analysis KW - hearing KW - perceptual constancy KW - spectral shape AB -

n vision, colour constancy allows the evaluation of the colour of objects independent of the spectral composition of a light source. In the auditory system, comparable mechanisms have been described that allows the evaluation of the spectral shape of sounds independent of the spectral composition of ambient background sounds. For echolocating bats, the evaluation of spectral shape is vitally important both for the analysis of external sounds and the analysis of the echoes of self-generated sonar emissions. Here, we investigated how the echolocating bat Phyllostomus discolor evaluates the spectral shape of transient sounds both in passive hearing and in echolocation as a specialized mode of active hearing. Bats were trained to classify transients of different spectral shape as low- or highpass. We then assessed how the spectral shape of an ambient background noise influenced the spontaneous classification of the transients. In the passive-hearing condition, the bats spontaneously changed their classification boundary depending on the spectral shape of the background. In the echo-acoustic condition, the classification boundary did not change although the background- and spectral-shape manipulations were identical in the two conditions. These data show that auditory processing differs between passive and active hearing: echolocation represents an independent mode of active hearing with its own rules of auditory spectral analysis.

VL - 211 UR - http://jeb.biologists.org/cgi/doi/10.1242/jeb.017715https://syndication.highwire.org/content/doi/10.1242/jeb.017715 IS - 12 JO - Journal of Experimental Biology ER -