Document Detail


From spatial frequency contrast to edge preponderance: the differential modulation of early visual evoked potentials by natural scene stimuli.
MedLine Citation:
PMID:  21426618     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The contrast response function of early visual evoked potentials elicited by sinusoidal gratings is known to exhibit characteristic potentials closely associated with the processes of parvocellular and magnocellular pathways. Specifically, the N1 component has been linked with parvocellular processes, while the P1 component has been linked with magnocellular processes. However, little is known regarding the response properties of the N1 and P1 components during the processing and encoding of complex (i.e., broadband) stimuli such as natural scenes. Here, we examine how established physical characteristics of natural scene imagery modulate the N1 and P1 components in humans by providing a systematic investigation of component modulation as visual stimuli are gradually built up from simple sinusoidal gratings to highly complex natural scene imagery. The results suggest that the relative dominance in signal output of the N1 and P1 components is dependent on spatial frequency (SF) luminance contrast for simple stimuli up to natural scene imagery possessing few edges. However, such a dependency shifts to a dominant N1 signal for natural scenes possessing abundant edge content and operates independently of SF luminance contrast.
Authors:
Bruce C Hansen; Theodore Jacques; Aaron P Johnson; Dave Ellemberg
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-23
Journal Detail:
Title:  Visual neuroscience     Volume:  -     ISSN:  1469-8714     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8809466     Medline TA:  Vis Neurosci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-17     Citation Subset:  -    
Affiliation:
Departments of Psychology and Neuroscience Program, Colgate University, Hamilton, New York.
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