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Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes
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Chewing variation in lepidosaurs and primates.

C F Ross1, A L Baden, J Georgi

  • 1Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA. rossc@uchicago.edu

The Journal of Experimental Biology
|February 2, 2010
PubMed
Summary
This summary is machine-generated.

Mammals chew more rhythmically than lepidosaurs due to differences in sensorimotor processing. Mammalian jaw movements are tightly regulated by the central nervous system (CNS) for optimal chewing cycles.

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Area of Science:

  • Comparative biomechanics
  • Neuroethology
  • Vertebrate physiology

Background:

  • Mammals exhibit more rhythmic chewing patterns compared to lepidosaurs.
  • Chewing rhythmicity is influenced by sensorimotor control systems.

Purpose of the Study:

  • To investigate the sensorimotor mechanisms underlying differences in chewing rhythmicity between mammals and lepidosaurs.
  • To analyze gape cycle phase durations and their variance in primates and lepidosaurs.

Main Methods:

  • Kinematic data analysis of jaw movements during chewing.
  • Comparative analysis of gape cycle phase durations and variance in four primate and eight lepidosaur species.

Main Results:

  • Primates show less variance in total gape cycle duration compared to lepidosaur species.
  • Mammalian gape cycle phase durations change isometrically with cycle time.
  • Lepidosaurs exhibit increased proportion of the slow-open phase with increased gape cycle duration variance.

Conclusions:

  • Differences in chewing rhythmicity stem from central nervous system (CNS) processing of sensory feedback, not sensory reception itself.
  • Mammalian CNS utilizes feed-forward mechanisms to modulate jaw movements and gape cycle phase durations.
  • The CNS's representation of optimal chew cycle duration is key to mammalian chewing efficiency.