| Chewing variation in lepidosaurs and primates. | |
| | |
MedLine Citation:
|
PMID: 20118308 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Mammals chew more rhythmically than lepidosaurs. The research presented here evaluated possible reasons for this difference in relation to differences between lepidosaurs and mammals in sensorimotor systems. Variance in the absolute and relative durations of the phases of the gape cycle was calculated from kinematic data from four species of primates and eight species of lepidosaurs. The primates exhibit less variance in the duration of the gape cycle than in the durations of the four phases making up the gape cycle. This suggests that increases in the durations of some gape cycle phases are accompanied by decreases in others. Similar effects are much less pronounced in the lepidosaurs. In addition, the primates show isometric changes in gape cycle phase durations, i.e. the relative durations of the phases of the gape cycle change little with increasing cycle time. In contrast, in the lepidosaurs variance in total gape cycle duration is associated with increases in the proportion of the cycle made up by the slow open phase. We hypothesize that in mammals the central nervous system includes a representation of the optimal chew cycle duration maintained using afferent feedback about the ongoing state of the chew cycle. The differences between lepidosaurs and primates do not lie in the nature of the sensory information collected and its feedback to the feeding system, but rather the processing of that information by the CNS and its use feed-forward for modulating jaw movements and gape cycle phase durations during chewing. |
| | |
Authors:
|
C F Ross; A L Baden; J Georgi; A Herrel; K A Metzger; D A Reed; V Schaerlaeken; M S Wolff |
Related Documents
:
|
3837018 - Circadian oscillators, cell cycles, and singularities: light perturbations of the free-... 19376248 - Detecting alpha rhythm phase reset by phase sorting: caveats to consider. 19212838 - Two steady-entrainment phases and graded masking effects by light generate different ci... 16136228 - A guideline for analyzing circadian wheel-running behavior in rodents under different l... 21864458 - Partitioning contrast or luminance disparity into perceived intensity and rotation. 2789128 - Large rod-like photopic signals in a possible new form of congenital night blindness. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
|
Title: The Journal of experimental biology Volume: 213 ISSN: 1477-9145 ISO Abbreviation: J. Exp. Biol. Publication Date: 2010 Feb |
Date Detail:
|
Created Date: 2010-02-01 Completed Date: 2010-04-13 Revised Date: 2010-05-19 |
Medline Journal Info:
|
Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
|
Languages: eng Pagination: 572-84 Citation Subset: IM |
Affiliation:
|
Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA. rossc@uchicago.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Biomechanics Lizards / physiology Mastication Primates / physiology* Reptiles / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Can red flowers be conspicuous to bees? Bombus dahlbomii and South American temperate forest flowers...
Next Document: Condition and mass impact oxygen stores and dive duration in adult female northern elephant seals.