| Isolating motion responses in visual evoked potentials by preadapting flicker-sensitive mechanisms. | |
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MedLine Citation:
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PMID: 12851804 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Onset of visual motion evokes a component in the EEG, the motion onset VEP. Exploring its motion specificity with a direction-specific adaptation paradigm, previous work demonstrated that less than 50% of the motion onset VEP represents actual motion detection. Here, we tested whether preadaptation of flicker-sensitive mechanisms can help to isolate motion-specific responses in the VEP. Flicker preadaptation was accomplished by limiting dot lifetime in the random-dot kinematograms that we used to study the direction specificity of motion adaptation. With unlimited dot lifetime, motion adaptation reduced the VEP amplitude to 35% (adapted direction) and 50% (opposite direction). With the shortest dot lifetime (40 ms), motion adaptation reduced the amplitude to 55% (adapted direction) and 70% (opposite direction). These findings suggest that random-dot kinematograms with short dot lifetimes could improve the investigation of human motion processing, be it in electrophysiology or other fields. While such stimuli successfully preadapt flicker-related components, they still evoke a sizable response, of which an estimated 70% is motion-specific. |
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Authors:
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J Peter Maurer; Michael Bach |
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Publication Detail:
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Type: Journal Article Date: 2003-07-08 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 151 ISSN: 0014-4819 ISO Abbreviation: Exp Brain Res Publication Date: 2003 Aug |
Date Detail:
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Created Date: 2003-08-11 Completed Date: 2004-01-05 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: Germany |
Other Details:
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Languages: eng Pagination: 536-41 Citation Subset: IM |
Affiliation:
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Elektrophysiologisches Labor, Universitäts-Augenklinik, Killianstr. 5, 79106, Freiburg, Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Electrooculography Evoked Potentials, Visual / physiology* Humans Motion Perception / physiology* Photic Stimulation |
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