Sound level discrimination by gray treefrogs in the presence and absence of chorus-shaped noise

Mark A. Bee, Alejandro Vélez, James D. Forester

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

An important aspect of hearing and acoustic communication is the ability to discriminate differences in sound level. Little is known about level discrimination in anuran amphibians (frogs and toads), for which vocal communication in noisy social environments is often critical for reproduction. This study used two-choice phonotaxis tests to investigate the ability of females of Cope's gray treefrog (Hyla chrysoscelis) to discriminate between two advertisement calls differing only in sound pressure level by 2, 4, or 6 dB. Tests were conducted in the presence and absence of chorus-shaped noise (73 dB) and using two different ranges of signal levels (73-79 dB and 79-85 dB). Females discriminated between two signals differing by as little as 2-4 dB. In contrast to expectations based on the "near miss to Weber's law" in birds and mammals, level discrimination was slightly better at the lower range of signal amplitudes, a finding consistent with earlier studies of frogs and insects. Realistic levels of background noise simulating a breeding chorus had no discernable effect on discrimination at the sound level differences tested in this study. These results have important implications for studies of auditory masking and signaling behavior in the contexts of anuran hearing and sound communication.

Original languageEnglish (US)
Pages (from-to)4188-4195
Number of pages8
JournalJournal of the Acoustical Society of America
Volume131
Issue number5
DOIs
StatePublished - May 2012

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discrimination
acoustics
frogs
communication
hearing
mammals
birds
insects
background noise
sound pressure
masking
Discrimination
Chorus
Sound
Communication
Hearing
Frog

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Sound level discrimination by gray treefrogs in the presence and absence of chorus-shaped noise. / Bee, Mark A.; Vélez, Alejandro; Forester, James D.

In: Journal of the Acoustical Society of America, Vol. 131, No. 5, 05.2012, p. 4188-4195.

Research output: Contribution to journalArticle

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