Document Detail

Light and target distance interact to control pupil size.
MedLine Citation:
PMID:  2316727     Owner:  NLM     Status:  MEDLINE    
Light and target distance stimuli were presented to normal human subjects, and their pupillary responses were measured. A homeomorphic computer model of the pupillary control system is presented in which the form of interaction of controller signals due to light and target distance was investigated. The error remaining when model parameters were optimized to fit experimental pupil size (area or diameter) was smaller for the linear interaction hypothesis than for either power law or logical law interaction. A generalized second-order nonlinear model with six parameters (vs. 3 for each of the other models) yielded somewhat lower residual error. With the use of a modified Akaike information criterion, the value (in an information theoretic sense) of the improved fit afforded by the three additional parameters in the generalized nonlinear model was shown to be small, and thus the generalized second-order nonlinear model was rejected in favor of the simpler and more parsimonious linear model.
G A Myers; S Barez; W C Krenz; L Stark
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  258     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1990 Mar 
Date Detail:
Created Date:  1990-04-23     Completed Date:  1990-04-23     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R813-9     Citation Subset:  IM    
Department of Engineering Science, University of California, Berkeley 94720.
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MeSH Terms
Models, Psychological*

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

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