{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,2]],"date-time":"2026-03-02T23:09:35Z","timestamp":1772492975708,"version":"3.50.1"},"reference-count":43,"publisher":"Acoustical Society of America (ASA)","issue":"3","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2003,9,1]]},"abstract":"<jats:p>In a psychophysical task with echoes that jitter in delay, big brown bats can detect changes as small as 10\u201320 ns at an echo signal-to-noise ratio of \u223c49 dB and 40 ns at \u223c36 dB. This performance is possible to achieve with ideal coherent processing of the wideband echoes, but it is widely assumed that the bat\u2019s peripheral auditory system is incapable of encoding signal waveforms to represent delay with the requisite precision or phase at ultrasonic frequencies. This assumption was examined by modeling inner-ear transduction with a bank of parallel bandpass filters followed by low-pass smoothing. Several versions of the filterbank model were tested to learn how the smoothing filters, which are the most critical parameter for controlling the coherence of the representation, affect replication of the bat\u2019s performance. When tested at a signal-to-noise ratio of 36 dB, the model achieved a delay acuity of 83 ns using a second-order smoothing filter with a cutoff frequency of 8 kHz. The same model achieved a delay acuity of 17 ns when tested with a signal-to-noise ratio of 50 dB. Jitter detection thresholds were an order of magnitude worse than the bat for fifth-order smoothing or for lower cutoff frequencies. Most surprising is that effectively coherent reception is possible with filter cutoff frequencies well below any of the ultrasonic frequencies contained in the bat\u2019s sonar sounds. The results suggest that only a modest rise in the frequency response of smoothing in the bat\u2019s inner ear can confer full phase sensitivity on subsequent processing and account for the bat\u2019s fine acuity or delay.<\/jats:p>","DOI":"10.1121\/1.1598195","type":"journal-article","created":{"date-parts":[[2003,8,29]],"date-time":"2003-08-29T14:14:56Z","timestamp":1062166496000},"page":"1648-1659","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":38,"title":["Evaluation of an auditory model for echo delay accuracy in wideband biosonar"],"prefix":"10.1121","volume":"114","author":[{"given":"Mark I.","family":"Sanderson","sequence":"first","affiliation":[{"name":"Department of Neuroscience, Brown University, Providence, Rhode Island\u200902912"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicola","family":"Neretti","sequence":"additional","affiliation":[{"name":"Brain Sciences, Brown University, Providence, Rhode Island\u200902912"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nathan","family":"Intrator","sequence":"additional","affiliation":[{"name":"Institute for Brain and Neural Systems, Brown University, Providence, Rhode Island\u200902912"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James A.","family":"Simmons","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Brown University, Providence, Rhode Island\u200902912"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2003,8,27]]},"reference":[{"key":"2023071322051971400_alt84"},{"key":"2023071322051971400_bee98","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1007\/s003590050176","article-title":"Bat sonar: An alternative interpretation of the 10-ns jitter result","volume":"182","year":"1998","journal-title":"J. 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