| Ideal observer for discrimination of the global direction of dynamic random-dot stimuli. | |
| | |
MedLine Citation:
|
PMID: 8478742 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Random-dot cinematograms in which each dot's successive movements are randomly drawn from a Gaussian distribution of directions can produce a percept of global coherent motion in a single direction. Discrimination of global direction was measured for various exposure durations, stimulus areas, and dot densities and bandwidths of the distribution of directions. Increasing the duration produced a greater improvement in performance than did increasing either the area or the density. Performance decreased as the distribution bandwidth increased. An ideal-observer model was developed, and the absolute efficiency for human direction discrimination was evaluated. Efficiencies were highest at large distribution bandwidths, with average efficiencies reaching 35%. A local-global noise model of direction discrimination, based on the ideal-observer model, containing a spatial and temporal integration limit as well as internal noise, was found to fit the human data well. The utility of ideal-observer analyses for psychophysical tasks and the interpretation of efficiencies is discussed. |
| | |
Authors:
|
S N Watamaniuk |
Publication Detail:
|
Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
|
Title: Journal of the Optical Society of America. A, Optics and image science Volume: 10 ISSN: 0740-3232 ISO Abbreviation: J Opt Soc Am A Publication Date: 1993 Jan |
Date Detail:
|
Created Date: 1993-05-24 Completed Date: 1993-05-24 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 8402086 Medline TA: J Opt Soc Am A Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 16-28 Citation Subset: IM; S |
Affiliation:
|
Department of Psychology, Northwestern University, Evanston, Illinois 60208. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Discriminant Analysis Humans Mathematics Models, Biological Motion Perception / physiology* Photic Stimulation Random Allocation |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Propagation of photon-density waves in strongly scattering media containing an absorbing semi-infini...
Next Document: Measurements of chromatic and achromatic afterimages.