Document Detail


A comparison of auditory brainstem responses and behavioral estimates of hearing sensitivity in Lemur catta and Nycticebus coucang.
MedLine Citation:
PMID:  19938053     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Primates depend on acoustic signals and cues to avoid predators, locate food, and share information. Accordingly, the structure and function of acoustic stimuli have long been emphasized in studies of primate behavioral and cognitive ecology. Yet, few studies have addressed how well primates hear such stimuli; indeed, the auditory thresholds of most primate species are unknown. This empirical void is due in part to the logistic and economic challenges attendant on traditional behavioral testing methods. Technological advances have produced a safe and cost-effective alternative-the auditory brainstem response (ABR) method, which can be utilized in field conditions, on virtually any animal species, and without subject training. Here we used the ABR and four methods of threshold determination to construct audiograms for two strepsirrhine primates: the ring-tailed lemur (Lemur catta) and slow loris (Nycticebus coucang). Next, to verify the general efficacy of the ABR method, we compared our results to published behaviorally-derived audiograms. We found that the four ABR threshold detection methods produced similar results, including relatively elevated thresholds but similarly shaped audiograms compared to those derived behaviorally. The ABR and behavioral absolute thresholds were significantly correlated, and the frequencies of best sensitivity and high-frequency limits were comparable. However, at frequencies < or =2 kHz, ABR thresholds were especially elevated, resulting in decreased agreement with behavioral thresholds and, in Lemur, the ABR 10-dB range starting points were more than 2 octaves higher than the behavioral points. Finally, a comparison of ABR- and behaviorally-derived audiograms from various animal taxa demonstrates the widespread efficacy of the ABR for estimating frequency of best sensitivity, but otherwise suggests caution; factors such as stimulus properties and threshold definition affect results. We conclude that the ABR method is a promising technique for estimating primate hearing sensitivity, but that additional data are required to explore its efficacy for estimating low-frequency thresholds.
Authors:
Marissa A Ramsier; Nathaniel J Dominy
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of primatology     Volume:  72     ISSN:  1098-2345     ISO Abbreviation:  Am. J. Primatol.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-01     Completed Date:  2010-04-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8108949     Medline TA:  Am J Primatol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  217-33     Citation Subset:  IM    
Copyright Information:
2009 Wiley-Liss, Inc.
Affiliation:
Department of Anthropology, University of California, Santa Cruz, USA. mramsier@ucsc.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Audiometry, Evoked Response
Auditory Threshold*
Behavior, Animal*
Evoked Potentials, Auditory, Brain Stem*
Female
Hearing
Lemur / physiology*,  psychology
Lorisidae / physiology*,  psychology
Male

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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