Compensation for the Effects of Head Acceleration on Jaw Movement in Speech

Shiller, Douglas M.; Ostry, David J.; Gribble, Paul L.; Laboissière, Rafaël

doi:10.1523/jneurosci.21-16-06447.2001

Cited by 16 publications

(9 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Anticipatory changes in muscle activity have been observed before the application of predictable loads to the jaw during cyclic raising and lowering movements (Ottenhoff et al 1992). Both stiffness change and reflex action in relation to self-generated loads may similarly provide for stability of the jaw in locomotion (Miles et al 2004;Shiller et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Voluntary Control of Human Jaw Stiffness

Shiller¹,

Houle²,

Ostry³

2005

Journal of Neurophysiology

Self Cite

View full text Add to dashboard Cite

Recent studies of human arm movement have suggested that the control of stiffness may be important both for maintaining stability and for achieving differences in movement accuracy. In the present study, we have examined the voluntary control of postural stiffness in 3D in the human jaw. The goal is to address the possible role of stiffness control in both stabilizing the jaw and in achieving the differential precision requirements of speech sounds. We previously showed that patterns of kinematic variability in speech are systematically related to the stiffness of the jaw. If the nervous system uses stiffness control as a means to regulate kinematic variation in speech, it should also be possible to show that subjects can voluntarily modify jaw stiffness. Using a robotic device, a series of force pulses was applied to the jaw to elicit changes in stiffness to resist displacement. Three orthogonal directions and three magnitudes of forces were tested. In all conditions, subjects increased the magnitude of jaw stiffness to resist the effects of the applied forces. Apart from the horizontal direction, greater increases in stiffness were observed when larger forces were applied. Moreover, subjects differentially increased jaw stiffness along a vertical axis to counteract disturbances in this direction. The observed changes in the magnitude of stiffness in different directions suggest an ability to control the pattern of stiffness of the jaw. The results are interpreted as evidence that jaw stiffness can be adjusted voluntarily, and thus may play a role in stabilizing the jaw and in controlling movement variation in the orofacial system.

show abstract

Section: Discussionmentioning

confidence: 99%

Voluntary Control of Human Jaw Stiffness

Shiller¹,

Houle²,

Ostry³

2005

Journal of Neurophysiology

Self Cite

View full text Add to dashboard Cite

show abstract

“…1). Effects of head acceleration caused by natural movements on jaw movements 22) , co-ordinated mandibular and head movements 23) , and also co-activations of the sternocleidomastoid muscle and craniocervical musculature 24) were discussed in the literature and might have had some effect on the result of the bite bar measurements. However, they seem to be negligible in comparison with the activation of neck muscles to maintain posture and voluntary forces to ensure a close contact between teeth and bite bare.…”

Section: Critique Of the Methodologymentioning

confidence: 99%

Seat-to-head Transfer Function of Seated Men ―Determination with Single and Three Axis Excitations at Different Magnitudes

et al. 2010

View full text Add to dashboard Cite

Most research has investigated the seat-to-head transmissibility during single-axis excitations. Associations between head accelerations and discomfort or effects on vision were reported. Possible differences between the seatto-head transmissibility determined during different vibration magnitudes with a variable number of excitation axes have not been systematically examined. An experimental study was performed with 8 male subjects sitting on a rigid seat with hands on a support. They were exposed to random whole-body vibration (E1=0.45 ms -2 , E2=0.90 ms -2 , and E3=1.80 ms -2 ) to single-and three-axis vibration. All translational and rotational seat-to-head transmissibilities were calculated. The effects of the factors vibration magnitude and number of axes on the peak modulus and frequency of the seat-to-head transmissibilities were tested. In general the head motions follow constant pattern. These pattern of head motions comprise a combination of rotational and translational shares of transmissions, i.e. the curves show a dependence on the factors 'vibration magnitude' and 'number of vibration axes'. Mechanical properties of the soft tissue, relative motions of body parts, and muscle reactions were supposed to cause the nonlinearities of the head. Future research should consider effects of multi-axis vibration, if conclusions shall be drawn for the evaluation of possible health effects and model validations.

show abstract

“…Due to the change in the orientation of gravitational forces in relation to the head, this position is likely to alter the vocal tract shape and its control. This is why many studies have tried to compare the production of speech sounds and speech articulations ͑either vowels or consonants͒ for subjects when they are sitting, standing, or lying ͑Weir et al., 1993;Tiede et al, 2000;Shiller et al, 2001;Stone et al, 2007͒. Our model allows the impact of gravity to be tested and quantitatively assessed. With this aim in view, the pattern of activation needed to keep the tongue in its neutral position was first studied in the presence of a gravitational field in an upright and in a supine position.…”

Section: Impact Of Gravity On Lingual Movementsmentioning

confidence: 99%

A biomechanical model of cardinal vowel production: Muscle activations and the impact of gravity on tongue positioning

Buchaillard

Perrier

Payan

2009

The Journal of the Acoustical Society of America

123

166

View full text Add to dashboard Cite

A three-dimensional (3D) biomechanical model of the tongue and the oral cavity, controlled by a functional model of muscle force generation (lambda-model of the equilibrium point hypothesis) and coupled with an acoustic model, was exploited to study the activation of the tongue and mouth floor muscles during the production of French cardinal vowels. The selection of the motor commands to control the tongue and the mouth floor muscles was based on literature data, such as electromyographic, electropalatographic, and cineradiographic data. The tongue shapes were also compared to data obtained from the speaker used to build the model. 3D modeling offered the opportunity to investigate the role of the transversalis, in particular, its involvement in the production of high front vowels. It was found, with this model, to be indirect via reflex mechanisms due to the activation of surrounding muscles, not voluntary. For vowel /i/, local motor command variations for the main tongue muscles revealed a non-negligible modification of the alveolar groove in contradiction to the saturation effect hypothesis, due to the role of the anterior genioglossus. Finally, the impact of subject position (supine or upright) on the production of French cardinal vowels was explored and found to be negligible.

show abstract

Compensation for the Effects of Head Acceleration on Jaw Movement in Speech

Cited by 16 publications

References 46 publications

Voluntary Control of Human Jaw Stiffness

Voluntary Control of Human Jaw Stiffness

Seat-to-head Transfer Function of Seated Men ―Determination with Single and Three Axis Excitations at Different Magnitudes

A biomechanical model of cardinal vowel production: Muscle activations and the impact of gravity on tongue positioning

Contact Info

Product

Resources

About