Document Detail

Absolute localization of vibrotactile stimuli on the torso.
MedLine Citation:
PMID:  18717387     Owner:  NLM     Status:  MEDLINE    
Vibrotactile mobility systems present spatial information such as the direction of a waypoint through a localized vibration on the torso. Using these systems requires the ability to determine the absolute location of the stimulus. Because data are available only on the ability to determine the relative location of stimuli on the torso, we developed a novel method for measuring absolute localization on the basis of triangulation. For 15 observers, we calculated the subjective location of visual and tactile stimuli on the frontal half of the torso. The size of the 95% confidence intervals around the subjective tactile locations is about the size of the stimuli (1.66 cm) and is slightly larger than that around the subjective visual locations (mean difference, 0.17 cm). The error in tactile judgments over and above that in the visual judgments is present only for locations near the body midline. When the subjective visual and tactile locations are not co-located, the difference can best be described by a shift along the radius from the body midaxis. The same holds for the differences between the veridical and the subjective locations. Therefore, the difference between the veridical and the subjective directions of a stimulus is small. The results make us believe that stimulus locations on the torso are coded in polar coordinates of which the angle is perceptual invariant and the distance is less important, probably because it varies with changes in, among other things, posture and breathing.
Jan B F van Erp
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perception & psychophysics     Volume:  70     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-22     Completed Date:  2008-10-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1016-23     Citation Subset:  IM    
Department of Human Interfaces, TNO Human Factors, Soesterberg, The Netherlands.
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MeSH Terms
Touch / physiology*
Visual Perception

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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