| Visual motion direction is represented in population-level neural response as measured by magnetoencephalography. | |
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MedLine Citation:
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PMID: 19285543 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We investigated whether direction information is represented in the population-level neural response evoked by the visual motion stimulus, as measured by magnetoencephalography. Coherent motions with varied speed, varied direction, and different coherence level were presented using random dot kinematography. Peak latency of responses to motion onset was inversely related to speed in all directions, as previously reported, but no significant effect of direction on latency changes was identified. Mutual information entropy (IE) calculated using four-direction response data increased significantly (>2.14) after motion onset in 41.3% of response data and maximum IE was distributed at approximately 20 ms after peak response latency. When response waveforms showing significant differences (by multivariate discriminant analysis) in distribution of the three waveform parameters (peak amplitude, peak latency, and 75% waveform width) with stimulus directions were analyzed, 87 waveform stimulus directions (80.6%) were correctly estimated using these parameters. Correct estimation rate was unaffected by stimulus speed, but was affected by coherence level, even though both speed and coherence affected response amplitude similarly. Our results indicate that speed and direction of stimulus motion are represented in the distinct properties of a response waveform, suggesting that the human brain processes speed and direction separately, at least in part. |
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Authors:
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Y Kaneoke; T Urakawa; R Kakigi |
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Publication Detail:
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Type: Journal Article Date: 2009-03-12 |
Journal Detail:
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Title: Neuroscience Volume: 160 ISSN: 1873-7544 ISO Abbreviation: Neuroscience Publication Date: 2009 May |
Date Detail:
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Created Date: 2009-04-20 Completed Date: 2009-08-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7605074 Medline TA: Neuroscience Country: United States |
Other Details:
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Languages: eng Pagination: 676-87 Citation Subset: IM |
Affiliation:
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Department of Integrative Physiology, National Institute for Physiological Sciences, Myodaiji-cho, Okazaki, Japan. kaneyo@nips.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Brain / physiology* Evoked Potentials, Visual Eye Movement Measurements Female Humans Magnetoencephalography Male Middle Aged Motion Perception / physiology* Neurons / physiology* Photic Stimulation Reaction Time |
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