K
Kirk R. Johnson
Researcher at Duke University
Publications - 25
Citations - 2274
Kirk R. Johnson is an academic researcher from Duke University. The author has contributed to research in topics: Masseter muscle & Masticatory force. The author has an hindex of 21, co-authored 25 publications receiving 2241 citations.
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Loading patterns and jaw movements during mastication in Macaca fascicularis: a bone-strain, electromyographic, and cineradiographic analysis.
TL;DR: The bone strain and jaw movement data indicate that during vigorous mastication the transition between fast close and the power stroke is correlated with a sharp increase in masticatory force, and they also show that in most instances the jaws of macaques are maximally loaded prior to maximum intercuspation.
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Masticatory-stress hypotheses and the supraorbital region of primates.
TL;DR: There is no good reason to believe that enlarged browridges in living and/or fossil primates are structural adaptations to counter intense masticatory forces.
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In vivo bone strain patterns in the zygomatic arch of macaques and the significance of these patterns for functional interpretations of craniofacial form.
TL;DR: Data indicate that levels of functional strains during chewing and biting are highly variable from one region of the face to the next, and therefore it is unlikely that all facial bones are especially designed so as to minimize bone tissue and maximize strength for countering masticatory loads.
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Symphyseal fusion and jaw-adductor muscle force: an EMG study.
TL;DR: Both the analysis of the W/B EMG ratios and the muscle firing pattern data support the hypothesis that symphyseal fusion and transversely-directed muscle force in anthropoids are functionally linked, which supports the hypotheses that the evolution of symphySEal fusion in anthropoid is an adaptation to strengthen the symphysis so as to counter increased wishboning stress during forceful unilateral mastication.
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Jaw muscle function and wishboning of the mandible during mastication in macaques and baboons
TL;DR: EMG data demonstrate that jaw-closing muscle recruitment patterns for macaques and baboons differ from those of humans, and it appears, based on previously published EMG data, that the human symphysis may also experience wishboning.