Document Detail

The effect of orientation on tactual braille recognition: optimal touching positions.
MedLine Citation:
PMID:  1620567     Owner:  NLM     Status:  MEDLINE    
Subjects in five experiments matched tangible braille against a visible matching code. In Experiment 1, braille recognition suffered when entire lines of braille characters were tilted in varying amounts from the upright. Experiment 2 showed that tilt lowered performance for tangible, large embossed letters, as well as for braille. However, recognition was better for print letters than it was for braille. In Experiment 3, subjects attempted to match the upright array against embossed braille that was left/right reversed, inverted up/down, or rotated +180 degrees. Performance was close to that for normal braille in the left/right reversal condition, and very low for the +180 degrees rotation group. These results on braille tilt in the "picture plane" may reflect difficulty in manipulating the tangible "image." Braille recognition performance was not lowered when the visible matching array was tilted -45 degrees or -90 degrees from the upright but the tangible stimuli were upright. In Experiment 4, recognition of left/right reversed braille that was physically horizontal (on the bottom of a shelf) was compared with that of braille left/right reversed due to its location on the back of a panel, in the vertical plane. Braille recognition accuracy was higher with braille located vertically. An additional experiment showed the beneficial effect of locating braille in the vertical, frontoparallel plane, obtained with +90 degree rotated braille. It is proposed that optimal tactual performance with tangible arrays might depend on touching position, and on the physical position of stimuli in space. Just as there are good and poor viewing positions, there may be optimal touching positions.(ABSTRACT TRUNCATED AT 250 WORDS)
M A Heller
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Perception & psychophysics     Volume:  51     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  1992 Jun 
Date Detail:
Created Date:  1992-08-06     Completed Date:  1992-08-06     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  549-56     Citation Subset:  C    
Winston-Salem State University, North Carolina.
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MeSH Terms
Pattern Recognition, Automated*
Perceptual Distortion / physiology
Research Design
Touch / physiology*
Visual Perception / physiology
Grant Support

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

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