Academic Journal
Influence of Correspondence Noise and Spatial Scaling on the Upper Limit for Spatial Displacement in Fully-Coherent Random-Dot Kinematogram Stimuli.
| Τίτλος: | Influence of Correspondence Noise and Spatial Scaling on the Upper Limit for Spatial Displacement in Fully-Coherent Random-Dot Kinematogram Stimuli. |
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| Συγγραφείς: | Tripathy, Srimant P., Shafiullah, Syed N., Cox, Michael J. |
| Πηγή: | PLoS ONE; Oct2012, Vol. 7 Issue 10, Special section p1-14, 14p |
| Θεματικοί όροι: | Motion detectors, Performance, Noise, Motion, Mechanical movements, Motion analysis, Human mechanics |
| Περίληψη: | Correspondence noise is a major factor limiting direction discrimination performance in random-dot kinematograms [1]. In the current study we investigated the influence of correspondence noise on Dmax, which is the upper limit for the spatial displacement of the dots for which coherent motion is still perceived. Human direction discrimination performance was measured, using 2-frame kinematograms having leftward/rightward motion, over a 200-fold range of dot-densities and a four-fold range of dot displacements. From this data Dmax was estimated for the different dot densities tested. A model was proposed to evaluate the correspondence noise in the stimulus. This model summed the outputs of a set of elementary Reichardt-type local detectors that had receptive fields tiling the stimulus and were tuned to the two directions of motion in the stimulus. A key assumption of the model was that the local detectors would have the radius of their catchment areas scaled with the displacement that they were tuned to detect; the scaling factor k linking the radius to the displacement was the only free parameter in the model and a single value of k was used to fit all of the psychophysical data collected. This minimal, correspondence-noise based model was able to account for 91% of the variability in the human performance across all of the conditions tested. The results highlight the importance of correspondence noise in constraining the largest displacement that can be detected. [ABSTRACT FROM AUTHOR] |
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| Βάση Δεδομένων: | Complementary Index |
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| Items | – Name: Title Label: Title Group: Ti Data: Influence of Correspondence Noise and Spatial Scaling on the Upper Limit for Spatial Displacement in Fully-Coherent Random-Dot Kinematogram Stimuli. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Tripathy%2C+Srimant+P%2E%22">Tripathy, Srimant P.</searchLink><br /><searchLink fieldCode="AR" term="%22Shafiullah%2C+Syed+N%2E%22">Shafiullah, Syed N.</searchLink><br /><searchLink fieldCode="AR" term="%22Cox%2C+Michael+J%2E%22">Cox, Michael J.</searchLink> – Name: TitleSource Label: Source Group: Src Data: PLoS ONE; Oct2012, Vol. 7 Issue 10, Special section p1-14, 14p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Motion+detectors%22">Motion detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Performance%22">Performance</searchLink><br /><searchLink fieldCode="DE" term="%22Noise%22">Noise</searchLink><br /><searchLink fieldCode="DE" term="%22Motion%22">Motion</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+movements%22">Mechanical movements</searchLink><br /><searchLink fieldCode="DE" term="%22Motion+analysis%22">Motion analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Human+mechanics%22">Human mechanics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Correspondence noise is a major factor limiting direction discrimination performance in random-dot kinematograms [1]. In the current study we investigated the influence of correspondence noise on Dmax, which is the upper limit for the spatial displacement of the dots for which coherent motion is still perceived. Human direction discrimination performance was measured, using 2-frame kinematograms having leftward/rightward motion, over a 200-fold range of dot-densities and a four-fold range of dot displacements. From this data Dmax was estimated for the different dot densities tested. A model was proposed to evaluate the correspondence noise in the stimulus. This model summed the outputs of a set of elementary Reichardt-type local detectors that had receptive fields tiling the stimulus and were tuned to the two directions of motion in the stimulus. A key assumption of the model was that the local detectors would have the radius of their catchment areas scaled with the displacement that they were tuned to detect; the scaling factor k linking the radius to the displacement was the only free parameter in the model and a single value of k was used to fit all of the psychophysical data collected. This minimal, correspondence-noise based model was able to account for 91% of the variability in the human performance across all of the conditions tested. The results highlight the importance of correspondence noise in constraining the largest displacement that can be detected. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of PLoS ONE is the property of Public Library of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1371/journal.pone.0042995 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 1 Subjects: – SubjectFull: Motion detectors Type: general – SubjectFull: Performance Type: general – SubjectFull: Noise Type: general – SubjectFull: Motion Type: general – SubjectFull: Mechanical movements Type: general – SubjectFull: Motion analysis Type: general – SubjectFull: Human mechanics Type: general Titles: – TitleFull: Influence of Correspondence Noise and Spatial Scaling on the Upper Limit for Spatial Displacement in Fully-Coherent Random-Dot Kinematogram Stimuli. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Tripathy, Srimant P. – PersonEntity: Name: NameFull: Shafiullah, Syed N. – PersonEntity: Name: NameFull: Cox, Michael J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2012 Type: published Y: 2012 Identifiers: – Type: issn-print Value: 19326203 Numbering: – Type: volume Value: 7 – Type: issue Value: 10 Titles: – TitleFull: PLoS ONE Type: main |
| ResultId | 1 |