Document Detail

Natural Scene Evoked Population Dynamics across Cat Primary Visual Cortex Captured with Voltage-Sensitive Dye Imaging.
MedLine Citation:
PMID:  21459837     Owner:  NLM     Status:  Publisher    
Neurons in primary visual cortex have been characterized by their selectivity to orientation, spatiotemporal frequencies, and motion direction, among others all essential parameters to decompose complex image structure. However, their concerted functioning upon real-world visual dynamics remained unobserved since most studies tested these parameters in isolation rather than in rich mixture. We used voltage-sensitive dye imaging to characterize population responses to natural scene movies, and for comparison, to well-established moving gratings. For the latter, we confirm previous observations of a deceleration/acceleration notch. Upon stimulation with natural movies, however, a subsequent acceleration component was almost absent. Furthermore, we found that natural stimuli revealed sparsely distributed nonseparable space-time dynamics, continuously modulated by movie motion. Net excitation levels detected with gratings were reached only rarely with natural movies. Emphasizing this observation, across the entire time course, both average and peak amplitudes were lower than nonspecific, that is, minimum, activity obtained for gratings. We estimated a necessary increase of ∼30% of movie contrast to match high grating activity levels. Our results suggest that in contrast to gratings, processing of complex natural input is based on a balanced and stationary interplay between excitation and inhibition and point to the importance of suppressive mechanisms in shaping the operating regime of cortical dynamics.
Selim Onat; Peter König; Dirk Jancke
Related Documents :
16049767 - Quantification of non-qb-reducing centers in leaves using a far-red pre-illumination.
16668047 - Light energy distribution in the brown alga macrocystis pyrifera (giant kelp).
16668147 - Analysis of changes in minimal and maximal fluorescence yields with irradiance and o(2)...
21236327 - Resolvability of components in complex tones and implications for theories of pitch per...
24928637 - The role of preload forces in spinal manipulation: experimental investigation of kinema...
8748517 - A new load application system for in vitro study of ligamentous injuries to the human k...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-31
Journal Detail:
Title:  Cerebral cortex (New York, N.Y. : 1991)     Volume:  -     ISSN:  1460-2199     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-4-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9110718     Medline TA:  Cereb Cortex     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Institute of Cognitive Science, Department of Neurobiopsychology, University Osnabrück, 49069 Osnabrück, Germany and.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Fake or Fantasy: Rapid Dissociation between Strategic Content Monitoring and Reality Filtering in Hu...
Next Document:  The role of sleep in directed forgetting and remembering of human memories.