Document Detail


Temporal properties of visual channels measured by masking.
MedLine Citation:
PMID:  4032095     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Threshold elevations for spatially localized test stimuli were measured as a function of the temporal frequency of a sinusoidal mask grating. Ten of these temporal-masking curves were determined, each using a test stimulus of different temporal frequency. It was found that these data could be accounted for by four temporal-tuning curves: one low-pass curve with a corner frequency of 8.0 Hz and three bandpass curves with bandwidths of 2.0-2.5 octaves and peaks all within the region 4.0-8.0 Hz. In another set of experiments, a series of 1 spatial-masking curves was determined, each using a test stimulus of different spatial frequency. Measurement of the entire series was repeated using 1.0- and 8.0-Hz mask temporal modulations. Spatial-masking data collected under the two temporal conditions could both be accounted for by a single set of seven spatial-tuning curves, without changing the shape of any of these curves. The data are therefore compatible with spatiotemporal separability. Finally, a large set of contrast-response curves (threshold elevation as a function of mask contrast) was collected. These curves were found to follow a power law whose exponent varied with the spatiotemporal conditions of the experiment.
Authors:
S R Lehky
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics and image science     Volume:  2     ISSN:  0740-3232     ISO Abbreviation:  J Opt Soc Am A     Publication Date:  1985 Aug 
Date Detail:
Created Date:  1985-10-22     Completed Date:  1985-10-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8402086     Medline TA:  J Opt Soc Am A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1260-72     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Form Perception*
Humans
Orientation
Pattern Recognition, Visual*
Perceptual Masking*
Psychophysics
Sensory Thresholds
Space Perception*
Time Factors
Grant Support
ID/Acronym/Agency:
EY 02158/EY/NEI NIH HHS

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


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