Document Detail

Identification confusions among letters of the alphabet.
MedLine Citation:
PMID:  6238125     Owner:  NLM     Status:  MEDLINE    
Black, uppercase letters, subtending 6.0' of arc in height, were presented tachistoscopically to 6 subjects. An exposure duration was chosen to keep the subject's identification performance at about 50% correct. On each trial a single letter was presented, and the subject was required to identify the letter by verbal response. The resulting 26 X 26 confusion matrix was based on 3,900 trials (150 trials per letter). Several models of visual processing were used to generate predicted confusions among letter pairs. Models based on template overlap, geometric features, and two-dimensional spatial frequency content (Fourier transforms) were tested. The highest correlation (.70) between actual and predicted confusions was attained by the model based on the Fourier transformed letters filtered by the human contrast sensitivity function. These results demonstrate that the spatial frequency content of visual patterns can provide a valuable metric for predicting their psychological similarity. The results further suggest that spatial frequency models of visual processing are competitive with feature analysis models.
M J Gervais; L O Harvey; J O Roberts
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of experimental psychology. Human perception and performance     Volume:  10     ISSN:  0096-1523     ISO Abbreviation:  J Exp Psychol Hum Percept Perform     Publication Date:  1984 Oct 
Date Detail:
Created Date:  1984-11-30     Completed Date:  1984-11-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7502589     Medline TA:  J Exp Psychol Hum Percept Perform     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  655-66     Citation Subset:  IM    
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MeSH Terms
Discrimination (Psychology) / physiology
Form Perception* / physiology
Models, Neurological
Models, Psychological
Pattern Recognition, Visual* / physiology
Space Perception* / physiology
Visual Cortex / physiology
Grant Support

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