NDLI: Interaction effects of visual stimulus speed and contrast on postural sway

Content Provider	PubMed Central
Author	Holten, Vivian Van, Der Smagt Maarten J. Verstraten, Frans A. J. Donker, Stella F.
Abstract	Manipulating the characteristics of visual stimuli that simulate self-motion through the environment can affect the resulting postural sway magnitude. In the present study, we address the question whether varying the contrast and speed of a linear translating dot pattern influences medial–lateral postural sway. In a first experiment, we investigated whether the postural sway magnitude increases with increasing dot speed, as was previously demonstrated for expanding and contracting stimuli. In a second experiment, we also manipulated the contrast of the stimuli. For reasons that high-contrast stimuli can be considered ‘perceptually’ stronger, we expect that higher-contrast stimuli induce more sway than lower-contrast stimuli. The results of the first experiment show that dot speed indeed influences postural sway, although in an unexpected way. For higher speeds, the sway is in the direction of the stimulus motion, yet for lower speeds the sway is in a direction opposite to the stimulus motion. The results of the second experiment show that dot contrast does affect postural sway, but that this depends on the speed of the moving dots. Interestingly, the direction of postural sway induced by a relatively low dot speed (4°/s) depends on dot contrast. Taken together, our results suggest that interactions between the visual, vestibular and proprioceptive system appear to be influenced by an internal representation of the visual stimulus, rather than being influenced by the external visual stimulus characteristics only.
Related Links	http://dx.doi.org/10.1007/s00221-015-4438-y
Ending Page	124
Page Count	12
Starting Page	113
File Format	PDF
ISSN	14321106
e-ISSN	14321106
Journal	Experimental Brain Research
Volume Number	234
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-01
Access Restriction	Open
Rights Holder	Springer Berlin Heidelberg
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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