Document Detail

A decomposition of electrocortical activity as a function of spatial frequency: a weighted multidimensional scaling analysis.
MedLine Citation:
PMID:  18471806     Owner:  NLM     Status:  MEDLINE    
In this study, we examined the usefulness of weighted multidimensional scaling (WMDS) to decompose electrocortical activity of multiple brain sources. This electrocortical activity was evoked by checkerboard stimuli of four different spatial frequencies (0.75, 1.5, 3.0, and 6.0 cpd), presented to 12 participants under passive viewing conditions. Visual evoked potentials (VEPs) were recorded with a high density montage of 60 electrodes. These data were analyzed by using WMDS, resulting in four different dimensions, each of which can be considered equivalent to a potential scalp distribution, i.e. dipole source. The first of these dipole sources, which were determined by brain electrical source analysis (BESA), was predominantly activated by higher spatial frequencies, the second and third were predominantly activated by lower spatial frequencies, while the third and fourth sources were characterized by hemispheric asymmetry. Moreover, the neural activity of these brain sources was characterized by different patterns as a function of spatial frequency and time. The results suggest that visual processing of spatial frequencies comprises relatively separate subsystems with different spatiotemporal response characteristics.
Cor Melis; Joke M P Baas; J Leon Kenemans; George R Mangun
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Brain research     Volume:  1214     ISSN:  0006-8993     ISO Abbreviation:  Brain Res.     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-06-02     Completed Date:  2008-09-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  116-26     Citation Subset:  IM    
Department of Experimental Psychology, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands.
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MeSH Terms
Analysis of Variance
Brain / physiology*
Brain Mapping*
Electroencephalography* / methods
Evoked Potentials, Visual / physiology*
Pattern Recognition, Visual
Photic Stimulation / methods
Reaction Time / physiology
Space Perception / physiology*
Visual Fields
Weights and Measures*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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