To the MARMAM community - This post announces that in June 2018 the American National Standards Institute (ANSI) published an ANSI standard entitled, "Procedure for Determining Audiograms in Toothed Whales through Evoked Potential Methods (ANSI/ASA S3/SC1.6-2018)." The new ANSI standard describes procedures for measuring auditory evoked potential (AEP) audiograms in odontocete cetaceans and provide recommendations in the areas of: • General equipment requirements • Stimulus waveforms for measuring hearing thresholds • Acoustic stimulus waveform calibration • Threshold estimation methods • Results reporting formats • Modulation rate transfer function determination • Background noise considerations • Testing arrangements, including types of electrodes and their placement.
There are numerous variations in AEP methods used to test toothed whale hearing that result in variable threshold measurements across species (and even within the same individual). The purpose of ANSI/ASA S3/SC1.6-2018 is to standardize methods such that the results of AEP hearing tests are comparable across laboratories and researchers. Ultimately, this should facilitate the incorporation of AEP hearing data into environmental stewardship efforts related to ocean noise issues. The standard can be obtained from the Acoustical Society of America Standards Store (https://acousticalsociety.org/standards/). As a reminder for those of you that are members of the Acoustical Society of America, you are entitled to five free standards downloads per year. Sincerely, Dorian Houser -- Dorian S. Houser, Ph.D. Director of Biologic and Bioacoustic Research Interim Director of Environmental Stewardship National Marine Mammal Foundation 877-360-5527 ext.112 dorian.hou...@nmmfoundation.org
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