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Two measures of temporal resolution in brown-headed cowbirds (Molothrus ater)

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Abstract

Studies of auditory temporal resolution in birds have traditionally examined processing capabilities by assessing behavioral discrimination of sounds varying in temporal structure. Here, temporal resolution of the brown-headed cowbird (Molothrus ater) was measured using two auditory evoked potential (AEP)-based methods: auditory brainstem responses (ABRs) to paired clicks and envelope following responses (EFRs) to amplitude-modulated tones. The basic patterns observed in cowbirds were similar to those found in other songbird species, suggesting similar temporal processing capabilities. The amplitude of the ABR to the second click was less than that of the first click at inter-click intervals less than 10 ms, and decreased to 30% at an interval of 1 ms. EFR amplitude was generally greatest at modulation frequencies from 335 to 635 Hz and decreased at higher and lower modulation frequencies. Compared to data from terrestrial mammals these results support recent behavioral findings of enhanced temporal resolution in birds. General agreement between these AEP results and behaviorally based studies suggests that AEPs can provide a useful assessment of temporal resolution in wild bird species.

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Abbreviations

ABR:

Auditory brainstem response

AEP:

Auditory evoked potential

EFR:

Envelope following response

MRTF:

Modulation rate transfer function

SAM:

Sinusoidal amplitude modulated

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Acknowledgments

We would like to thank E. Fernández-Juricic and P. Baumhardt for assistance in acquiring birds, and N. Robinson, L. Brierley, K. Ronald, J. Losier, J. Randolet, and B. Moore for their feedback on this manuscript. All methods were approved by the Purdue Animal Care and Use Committee under protocol number 08–132.

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Authors and Affiliations

  1. Department of Biological Sciences, Lilly Hall, Purdue University, 915 W. State St., West Lafayette, IN, 47907, USA

    Megan D. Gall & Jeffrey R. Lucas

  2. Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN, 47907, USA

    Kenneth S. Henry

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  1. Megan D. Gall
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  2. Kenneth S. Henry
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  3. Jeffrey R. Lucas
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Correspondence to Megan D. Gall.

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Gall, M.D., Henry, K.S. & Lucas, J.R. Two measures of temporal resolution in brown-headed cowbirds (Molothrus ater). J Comp Physiol A 198, 61–68 (2012). https://doi.org/10.1007/s00359-011-0687-9

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  • DOI: https://doi.org/10.1007/s00359-011-0687-9

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