| Locomotor head movements and semicircular canal morphology in primates. | |
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MedLine Citation:
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PMID: 23045679 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Animal locomotion causes head rotations, which are detected by the semicircular canals of the inner ear. Morphologic features of the canals influence rotational sensitivity, and so it is hypothesized that locomotion and canal morphology are functionally related. Most prior research has compared subjective assessments of animal "agility" with a single determinant of rotational sensitivity: the mean canal radius of curvature (R). In fact, the paired variables of R and body mass are correlated with agility and have been used to infer locomotion in extinct species. To refine models of canal functional morphology and to improve locomotor inferences for extinct species, we compare 3D vector measurements of head rotation during locomotion with 3D vector measures of canal sensitivity. Contrary to the predictions of conventional models that are based upon R, we find that axes of rapid head rotation are not aligned with axes of either high or low sensitivity. Instead, animals with fast head rotations have similar sensitivities in all directions, which they achieve by orienting the three canals of each ear orthogonally (i.e., along planes at 90° angles to one another). The extent to which the canal configuration approaches orthogonality is correlated with rotational head speed independent of body mass and phylogeny, whereas R is not. |
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Authors:
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Michael D Malinzak; Richard F Kay; Timothy E Hullar |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2012-10-08 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 109 ISSN: 1091-6490 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 2012 Oct |
Date Detail:
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Created Date: 2012-11-01 Completed Date: 2013-01-08 Revised Date: 2013-05-20 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: United States |
Other Details:
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Languages: eng Pagination: 17914-9 Citation Subset: IM |
Affiliation:
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Department of Evolutionary Anthropology, Duke University, Durham, NC 27708, USA. michael.malinzak@duke.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biomechanics Head Movements* Locomotion* Primates / physiology* Semicircular Canals / anatomy & histology* |
| Grant Support | |
ID/Acronym/Agency:
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K08 DC006869/DC/NIDCD NIH HHS; P30 AR057235/AR/NIAMS NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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