Document Detail

Effects of familiarity on neural activity in monkey inferior temporal lobe.
MedLine Citation:
PMID:  18296433     Owner:  NLM     Status:  MEDLINE    
Long-term familiarity facilitates recognition of visual stimuli. To better understand the neural basis for this effect, we measured the local field potential (LFP) and multiunit spiking activity (MUA) from the inferior temporal (IT) lobe of behaving monkeys in response to novel and familiar images. In general, familiar images evoked larger amplitude LFPs whereas MUA responses were greater for novel images. Familiarity effects were attenuated by image rotations in the picture plane of 45 degrees. Decreasing image contrast led to more pronounced decreases in LFP response magnitude for novel, compared with familiar images, and resulted in more selective MUA response profiles for familiar images. The shape of individual LFP traces could be used for stimulus classification, and classification performance was better for the familiar image category. Recording the visual and auditory evoked LFP at multiple depths showed significant alterations in LFP morphology with distance changes of 2 mm. In summary, IT cortex shows local processing differences for familiar and novel images at a time scale and in a manner consistent with the observed behavioral advantage for classifying familiar images and rapidly detecting novel stimuli.
Britt Anderson; Ryan E B Mruczek; Keisuke Kawasaki; David Sheinberg
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-02-21
Journal Detail:
Title:  Cerebral cortex (New York, N.Y. : 1991)     Volume:  18     ISSN:  1460-2199     ISO Abbreviation:  Cereb. Cortex     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-16     Completed Date:  2008-12-22     Revised Date:  2014-03-27    
Medline Journal Info:
Nlm Unique ID:  9110718     Medline TA:  Cereb Cortex     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2540-52     Citation Subset:  IM    
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MeSH Terms
Acoustic Stimulation
Evoked Potentials, Visual / physiology*
Eye Movements / physiology
Macaca mulatta
Photic Stimulation
Psychomotor Performance / physiology
Recognition (Psychology) / physiology*
Temporal Lobe / physiology*
Grant Support

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

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