Document Detail

Analysis of perisaccadic field potentials in the occipitotemporal pathway during active vision.
MedLine Citation:
PMID:  12878708     Owner:  NLM     Status:  MEDLINE    
Eye movement potentials (EMPs) associated with saccades appear in both subcortical and cortical structures of the primate visual system. In this study, EMPs are recorded across sites in the occipitotemporal (OT) pathway of monkeys performing a pattern-recognition task. We characterize pair recordings of saccade-triggered local field potentials (LFPs) in early extrastriate and inferotemporal regions of the ventral visual pathway using time-frequency spectrograms. Parameters of the spectrograms, including the centroids of identified regions of interest in the time-frequency plane, are extracted and analyzed. Comparisons among the distributions of the extracted parameters reveal that the occipital lobe EMPs are largely postsaccadic events centered at 100 ms after saccade onset that are typically not influenced in timing by the direction of the saccade or the appearance of a stimulus transient appearing either before or after the saccade. The occipital lobe EMPs also demonstrate a significant shift in frequency content during their transient time course that is influenced, in a few cases, by saccade direction. Temporal lobe EMPs, on the other hand, may be centered in either the presaccadic or postsaccadic intervals; the time of their appearance is significantly influenced by the direction of the saccade. Temporal lobe EMPs demonstrate less frequency modulation than those recorded in the occipital lobe. The prevalence of EMPs in the OT pathway suggests that many cortical regions important for pattern recognition can be modulated by saccades. The timing and frequency characteristics of these signals suggest that the nature of this perisaccadic modulation varies across the cortex.
Keith P Purpura; Steven F Kalik; Nicholas D Schiff
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.     Date:  2003-07-23
Journal Detail:
Title:  Journal of neurophysiology     Volume:  90     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2003-11-17     Completed Date:  2004-01-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3455-78     Citation Subset:  IM    
Department of Neurology and Neuroscience, Weill Medical College and Graduate School of Medical Sciences of Cornell University,New York, New York 10021, USA.
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MeSH Terms
Action Potentials / physiology*
Macaca mulatta
Neural Pathways / physiology
Occipital Lobe / physiology*
Photic Stimulation / methods
Saccades / physiology*
Temporal Lobe / physiology*
Vision, Ocular / physiology
Visual Fields / physiology*
Grant Support

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

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