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mso-paper-source:0;}div.WordSection1 {page:WordSection1;}--My co-authors and I
would like to providesome information on our recent paper on the detection of
complex sounds byseals and sea lions. The goal of thisstudy was to test how
auditory data predict detection of complex sounds inquiet and noisy conditions.
Our resultsindicate that pinnipeds may utilize certain common features of
natural soundsto enhance detectability. We believethat this study is relevant
given current efforts to predict the effects ofanthropogenic noise on marine
mammal species. Please let me know if youhave any comments or questions. Thank
You,Kane Cunningham -- “Auditory sensitivity of seals and sealions in complex
listening scenarios.” Cunningham, K. A., Southall, B. L.,& Reichmuth, C.
Abstract Standardaudiometric data, such as audiograms and critical ratios, are
often used toinform marine mammal noise-exposure criteria. However, these
measurements areobtained using simple, artificial stimuli—i.e., pure tones and
flat-spectrumnoise—while natural sounds typically have more complex structure.
In thisstudy, detection thresholds for complex signals were measured in (I)
quiet and(II) masked conditions for one California sea lion (Zalophus
californianus )and one harbor seal (Phoca vitulina ). In Experiment I,
detection thresholds inquiet conditions were obtained for complex signals
designed to isolate threecommon features of natural sounds: Frequency
modulation, amplitude modulation,and harmonic structure. In Experiment II,
detection thresholds were obtainedfor the same complex signals embedded in two
types of masking noise: Syntheticflat-spectrum noise and recorded shipping
noise. To evaluate how accuratelystandard hearing data predict detection of
complex sounds, the results of ExperimentsI and II were compared to predictions
based on subject audiograms and criticalratios combined with a basic hearing
model. Both subjects exhibited greater-than-predicted sensitivity to
harmonicsignals in quiet and masked conditions, as well as to
frequency-modulatedsignals in masked conditions. These differences indicate
that the complexfeatures of naturally occurring sounds enhance detectability
relative to simplestimuli. The Journal of the Acoustical Societyof America,
136(6), 3410-3421 (2014). --
Kane Cunningham
Pinniped Cognition and Sensory Systems Laboratory
e: [email protected]
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