| Apparent speed increases at low luminance. | |
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MedLine Citation:
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PMID: 19146275 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To investigate the effect of luminance on apparent speed, subjects adjusted the speed of a low-luminance rotating grating (0.31 cd/m(2)) to match that of a high-luminance one (1260 cd/m(2)). Above 4 Hz, subjects overestimated the speed of the low-luminance grating. This overestimation increased as a function of temporal rate and reached 30% around 10 Hz temporal rates. The speed overestimation became significant once the lower luminance was 2.4 log units lower than the high luminance comparison. Next the role of motion smear in speed overestimation was examined. First it was shown that the length of the perceived motion smear increased at low luminances. Second, the length of the visible smear was manipulated by changing the presentation time of the stimuli. Speed overestimation was reduced at shorter presentation times. Third the speed of a blurred stimulus was compared to a stimulus with sharp edges and the blurred stimulus was judged to move faster. These results indicate that the length of motion smear following a target contributes to its perceived speed and that this leads to speed overestimation at low luminance where motion traces lengthen because of increased persistence. |
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Authors:
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Maryam Vaziri-Pashkam; Patrick Cavanagh |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural Date: 2008-12-22 |
Journal Detail:
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Title: Journal of vision Volume: 8 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2008 |
Date Detail:
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Created Date: 2009-01-16 Completed Date: 2009-04-21 Revised Date: 2011-09-26 |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: 9.1-12 Citation Subset: IM |
Affiliation:
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Vision Sciences Laboratory, Department of Psychology, Harvard University, Cambridge, MA 02138, USA. mvaziri@fas.harvard.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Contrast Sensitivity / physiology Cues Dose-Response Relationship, Radiation Humans Light* Motion Perception / physiology, radiation effects* Photic Stimulation / methods Space Perception / physiology Time Perception / physiology, radiation effects* Visual Perception / physiology, radiation effects* |
| Grant Support | |
ID/Acronym/Agency:
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EY09258/EY/NEI NIH HHS; R01 EY009258-17/EY/NEI NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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