| What a difference a parameter makes: a psychophysical comparison of random dot motion algorithms. | |
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MedLine Citation:
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PMID: 19336240 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Random dot motion (RDM) displays have emerged as one of the standard stimulus types employed in psychophysical and physiological studies of motion processing. RDMs are convenient because it is straightforward to manipulate the relative motion energy for a given motion direction in addition to stimulus parameters such as the speed, contrast, duration, density, aperture, etc. However, as widely as RDMs are employed so do they vary in their details of implementation. As a result, it is often difficult to make direct comparisons across studies employing different RDM algorithms and parameters. Here, we systematically measure the ability of human subjects to estimate motion direction for four commonly used RDM algorithms under a range of parameters in order to understand how these different algorithms compare in their perceptibility. We find that parametric and algorithmic differences can produce dramatically different performances. These effects, while surprising, can be understood in relationship to pertinent neurophysiological data regarding spatiotemporal displacement tuning properties of cells in area MT and how the tuning function changes with stimulus contrast and retinal eccentricity. These data help give a baseline by which different RDM algorithms can be compared, demonstrate a need for clearly reporting RDM details in the methods of papers, and also pose new constraints and challenges to models of motion direction processing. |
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Authors:
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Praveen K Pilly; Aaron R Seitz |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S. Date: 2009-03-29 |
Journal Detail:
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Title: Vision research Volume: 49 ISSN: 1878-5646 ISO Abbreviation: Vision Res. Publication Date: 2009 Jun |
Date Detail:
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Created Date: 2009-06-03 Completed Date: 2009-12-14 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 1599-612 Citation Subset: IM |
Affiliation:
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Department of Cognitive and Neural Systems, Center for Adaptive Systems, Boston University, 677 Beacon St., Boston, MA 02215, United States. advait@cns.bu.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Algorithms Contrast Sensitivity / physiology Female Humans Male Motion Perception / physiology* Photic Stimulation / methods Psychophysics Young Adult |
| Grant Support | |
ID/Acronym/Agency:
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R01-DC02852/DC/NIDCD NIH HHS; R21 EY017737-01/EY/NEI NIH HHS; R21-EY017737/EY/NEI NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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