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Visual-Vestibular Integration in Gymnasts

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons83808

Beykirch,  K
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

von Lassberg, C., Beykirch, K., Mühlbauer, T., & Krug, J. (2004). Visual-Vestibular Integration in Gymnasts. Poster presented at 7th Tübingen Perception Conference (TWK 2004), Tübingen, Germany.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-DA1F-1
Abstract
Berger et al. [1] have shown the general dominance of visual to vestibular perception in a setting of combined stimulation requiring integration of sensory modalities. In the present study we evaluate different integration strategies during presentation of dissociated visual-vestibular stimuli as a function of the individual spacial orientation ability of the subjects. We present the results of the gymnasts for discussion. The subjects (n = 10, age: 10–13, height: 140,33 +/- 4,09, mass: 32,89 +/- 2,32) were rotated in a spherical chamber, with simultaneous presentation of a planetarium type visual stimulus with an independently controlled velocity. Testing consisted of a standardized randomized sequence of 26 horizontal rotations in both directions with different visual-vestibular dissociation factors (the difference between the velocities, normalized to the rotational velocity). The factors presented were in steps of 0.2 between 1 and -1, and additionally 2 and -2. Auditory stimuli were blocked using headphones. The rotatory stimulus consisted of a velocity step of 60deg/s with a duration of 6 seconds. After each turn, two questions were asked: 1. “Which direction did the stars turn in relation to you?” (to control for visual perception and concentration) 2. “Which direction did the stars turn in relation to the room?” (to test the visual-vestibular integration). Correlation analysis of correct responses to question 2 against the individual “perrotatory space orientation ability” (PSO) as independantly evaluated by three coaches was performed. Results: A positive correlation between the visual-vestibular dissociation factors and the number of correct answers to question 2 was found [Pearson: r = 0,81 with positive dissociation factor (determination coefcient: 0,65); r = 0,81 with negative dissociation factor (determination coefcient: 0,66)]. However, there was a negative correlation tendency between the ratio of the correct answers and the PSO of the subjects (Spearman, rank using the coach questionnaires:k=0.60, determination coefcient: 0,36). Discussion: The rst result corresponds to previous work and demonstrates the dominance of visual to vestibular perception for lower dissociation factors. More remarkable is the second result showing the higher the PRO, the worse the ability to determine the stars' direction. The results require one to consider that perhaps the gymnasts have learned to give a superior weight to the visual information over the vestibular sensation, not as an integrative strategy, but rather a form of sensory ltering. This opens the discussion for how best to evaluate the integrative or ltering abilities of the age-matched group of non-athletes.