Document Detail

Relationship between stimulus complexity and neuronal activity in the inferotemporal cortex of the macaque monkey.
MedLine Citation:
PMID:  15561495     Owner:  NLM     Status:  MEDLINE    
The single-unit activity of 217 cells was recorded from the inferotemporal cortex (IT) of two awake macaque monkeys while they performed a fixation task. The stimuli were coloured geometrical shapes or coloured representations of natural or artificial objects. To determine whether the stimuli could be separated into groups on the basis on neuronal population behaviour, the responses to the images were analysed by factor analysis and cluster analysis. It was a common result of each analysis that, on the basis of neuronal responses, the stimulus set could be separated into two groups, despite the lack of difference in mean response rate to them. Similar groups were formed when only the first half of the responses was analysed. The results suggest a differential coding of the images of simple geometrical shapes and of the images of complex, real (photographic) objects. We found significant differences between the two stimulus groups in physical features, other than size or luminance. Our results suggest that the same neurone population might respond differently to simple and complex images in the first 150 ms of their responses. The differences might be attributed to "non-obvious" physical features of the stimuli, such as the amount of internal lines in the images, colourfulness and the length of perimeter of the stimuli.
Gy Sáry; Z Chadaide; T Tompa; Gy Kovács; K Köteles; K Boda; L Raduly; Gy Benedek
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain research. Cognitive brain research     Volume:  22     ISSN:  0926-6410     ISO Abbreviation:  Brain Res Cogn Brain Res     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2004-11-24     Completed Date:  2005-02-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9214304     Medline TA:  Brain Res Cogn Brain Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1-12     Citation Subset:  IM    
Department of Physiology, University of Szeged, H-6720, Dóm tér 10, Szeged, Hungary.
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MeSH Terms
Action Potentials / physiology*
Brain Mapping
Cell Count / methods
Cerebral Cortex / cytology*
Cluster Analysis
Color Perception / physiology*
Discrimination (Psychology)
Factor Analysis, Statistical
Neurons / classification,  physiology*
Photic Stimulation / methods
Wakefulness / physiology

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

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