Document Detail

Tactile diplopia (diplesthesia) on the human fingers.
MedLine Citation:
PMID:  3774481     Owner:  NLM     Status:  MEDLINE    
The third and fourth fingertips of five subjects were pressed against each other so as to produce a skin displacement. A single spherical stimulus was then applied simultaneously to the two fingertips in order to test perceptual experiences with different amounts of skin displacement. The results show that the probability of detecting one stimulus when a single stimulus was applied to the skin in the resting position was 0.90. This probability decreased with increments in skin displacement. At the maximum skin displacement tested the probability of detecting one stimulus when a single stimulus was applied to the two displaced fingertip surfaces was only 0.04: this means that the single stimulus was perceived to be double with a probability of 0.96. The occurrence of this doubling, similar to Aristotle's crossed-finger illusion, shows that a diplopia-like phenomenon is present in the somesthetic system. How this 'tactile diplopia' could represent an interesting approach to the study of tactile perception is discussed.
F Benedetti
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perception     Volume:  15     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  1986  
Date Detail:
Created Date:  1986-11-24     Completed Date:  1986-11-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  83-91     Citation Subset:  IM    
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MeSH Terms
Illusions / physiology*
Skin Physiological Phenomena
Touch / physiology*

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