The Distributed Lambda (?) Model (DLM): A 3-D, Finite-Element Muscle Model Based on Feldman's ? Model; Assessment of Orofacial Gestures
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| Title: | The Distributed Lambda (?) Model (DLM): A 3-D, Finite-Element Muscle Model Based on Feldman's ? Model; Assessment of Orofacial Gestures |
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| Language: | English |
| Authors: | Nazari, Mohammad Ali, Perrier, Pascal, Payan, Yohan |
| Source: | Journal of Speech, Language, and Hearing Research. Dec 2013 56(6):S1909-S1923. |
| Availability: | American Speech-Language-Hearing Association (ASHA). 10801 Rockville Pike, Rockville, MD 20852. Tel: 800-638-8255; Fax: 301-571-0457; e-mail: subscribe@asha.org; Web site: http://jslhr.asha.org |
| Peer Reviewed: | Y |
| Page Count: | 15 |
| Publication Date: | 2013 |
| Document Type: | Journal Articles Reports - Research |
| Descriptors: | Models, Biology, Human Body, Evaluation, Articulation (Speech), Stress Variables, Biomechanics, Computer Simulation, Comparative Analysis |
| ISSN: | 1092-4388 |
| Abstract: | Purpose: The authors aimed to design a distributed lambda model (DLM), which is well adapted to implement three-dimensional (3-D), finite-element descriptions of muscles. Method: A muscle element model was designed. Its stress-strain relationships included the active force-length characteristics of the ? model along the muscle fibers, together with the passive properties of muscle tissues in the 3-D space. The muscle element was first assessed using simple geometrical representations of muscles in the form of rectangular bars. It was then included in a 3-D face model, and its impact on lip protrusion was compared with the impact of a Hill-type muscle model. Results: The force-length characteristic associated with the muscle elements matched well with the invariant characteristics of the ? model. The impact of the passive properties was assessed. Isometric force variation and isotonic displacements were modeled. The comparison with a Hill-type model revealed strong similarities in terms of global stress and strain. Conclusion: The DLM accounted for the characteristics of the ? model. Biomechanically, no clear differences were found between the DLM and a Hill-type model. Accurate evaluations of the ? model, based on the comparison between data and simulations, are now possible with 3-D biomechanical descriptions of the speech articulators because of the DLM. |
| Abstractor: | As Provided |
| Entry Date: | 2014 |
| Access URL: | https://jslhr.pubs.asha.org/Article.aspx?articleid=1802796 |
| Accession Number: | EJ1029456 |
| Database: | ERIC |
| Abstract: | Purpose: The authors aimed to design a distributed lambda model (DLM), which is well adapted to implement three-dimensional (3-D), finite-element descriptions of muscles. Method: A muscle element model was designed. Its stress-strain relationships included the active force-length characteristics of the ? model along the muscle fibers, together with the passive properties of muscle tissues in the 3-D space. The muscle element was first assessed using simple geometrical representations of muscles in the form of rectangular bars. It was then included in a 3-D face model, and its impact on lip protrusion was compared with the impact of a Hill-type muscle model. Results: The force-length characteristic associated with the muscle elements matched well with the invariant characteristics of the ? model. The impact of the passive properties was assessed. Isometric force variation and isotonic displacements were modeled. The comparison with a Hill-type model revealed strong similarities in terms of global stress and strain. Conclusion: The DLM accounted for the characteristics of the ? model. Biomechanically, no clear differences were found between the DLM and a Hill-type model. Accurate evaluations of the ? model, based on the comparison between data and simulations, are now possible with 3-D biomechanical descriptions of the speech articulators because of the DLM. |
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| ISSN: | 1092-4388 |
