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Personne :
Teasdale, Normand

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Teasdale

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Normand

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Université Laval. Département de kinésiologie

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ncf10139615

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Voici les éléments 1 - 2 sur 2
  • PublicationAccès libre
    Change in the natural head-neck orientation momentarily altered sensorimotor control during sensory transition
    (2017-01-17) Simoneau, Martin; Teasdale, Normand; Laurendeau, Simon; Xu, Isabelle
    Achilles tendon vibration generates proprioceptive information that is incongruent with the actual body position; it alters the perception of body orientation leading to a vibration-induced postural response. When a person is standing freely, vibration of the Achilles tendon shifts the internal representation of the verticality backward thus the vibration-induced postural response realigned the whole body orientation with the shifted subjective vertical. Because utricular otoliths information participates in the creation of the internal representation of the verticality, changing the natural orientation of the head-neck system during Achilles tendon vibration could alter the internal representation of the earth vertical to a greater extent. Consequently, it was hypothesized that compared to neutral head-neck orientation, alteration in the head-neck orientation should impair balance control immediately after Achilles tendon vibration onset or offset (i.e., sensory transition) as accurate perception of the earth vertical is required. Results revealed that balance control impairment was observed only immediately following Achilles tendon vibration offset; both groups with the head-neck either extended or flexed showed larger body sway (i.e., larger root mean square scalar distance between the center of pressure and center of gravity) compared to the group with the neutral head-neck orientation. The fact that balance control was uninfluenced by head-neck orientation immediately following vibration onset suggests the error signal needs to accumulate to a certain threshold before the internal representation of the earth vertical becomes incorrect.
  • PublicationAccès libre
    Alternative avenues in the assessment of driving capacities in older drivers and implications for training
    (Cambridge University Press, 2010-12-01) Simoneau, Martin; Teasdale, Normand; Gamache, Pierre.; Hudon, Carol
    The population aging, combined with the overrepresentation of older drivers in car crashes, engendered a whole body of research destined at finding simple and efficient assessment methods of driving capacities. However, this quest is little more than a utopian dream, given that car crashes and unsafe driving behaviours can result from a plethora of interacting factors. This review highlights the main problems of the current assessment methods and training programs, and presents theoretical and empirical arguments justifying the need of reorienting the research focus. Our discussion is elaborated in light of the fundamental principle of specificity in learning and practice. We also identify overlooked variables that are deterministic when assessing, and training, a complex ability like driving. We especially focus on the role of the sensorimotor transformation process. Finally, we propose alternative methods that are in-line with the recent trends in educational programs that use virtual reality and simulation technologies.