| Neuromagnetic evoked responses to complex motions are greatest for expansion. | |
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MedLine Citation:
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PMID: 15649546 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We analysed evoked magnetic responses to moving random dot stimuli, initially using a 19-channel magnetoencephalography (MEG) system, and subsequently using a 151-channel MEG system. Random dot displays were used to construct complex motion sequences, which we refer to as expansion, contraction, deformation, and rotation. We also investigated lateral translation and a condition in which the directions of the dots were randomised. In all stimulus conditions, the dots were first stationary, then traveled for a brief period (317 s or 542 ms), and were then stationary again. In all conditions, evoked magnetic responses were observed with a widespread bilateral distribution over the observers' heads. Initial recordings revealed a substantially larger evoked magnetic response to the expansion condition than the other conditions. In a revised study, we used a 151-channel MEG system and two stimulus diameters (9.3 and 48 deg), the smaller comparable with the first experiment. The responses were analysed using a nonparametric approach and confirmed our initial observations. In a third study, speed gradients were removed and a new design permitted direct comparisons between motion conditions. The results from all three experiments are consistent with the greater ecological validity of the expansion stimulus. |
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Authors:
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Ian E Holliday; Tim S Meese |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: International journal of psychophysiology : official journal of the International Organization of Psychophysiology Volume: 55 ISSN: 0167-8760 ISO Abbreviation: Int J Psychophysiol Publication Date: 2005 Feb |
Date Detail:
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Created Date: 2005-01-14 Completed Date: 2005-04-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8406214 Medline TA: Int J Psychophysiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 145-57 Citation Subset: IM |
Affiliation:
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The Wellcome Trust Laboratory for MEG Studies, Neurosciences Research Institute, Aston University, Birmingham, B4 7ET, UK. i.e.holliday@aston.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Brain / physiology* Brain Mapping Evoked Potentials / physiology* Female Functional Laterality / physiology Humans Magnetoencephalography* Male Middle Aged Motion* Motion Perception / physiology* Optical Illusions / physiology Pattern Recognition, Visual / physiology Photic Stimulation / methods Psychophysics / methods Reaction Time / physiology Rotation Statistics, Nonparametric Time Factors |
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