Document Detail

Repetition suppression of induced gamma activity predicts enhanced orienting toward a novel stimulus in 6-month-old infants.
MedLine Citation:
PMID:  18457506     Owner:  NLM     Status:  MEDLINE    
Habituation refers to a decline in orienting or responding to a repeated stimulus, and can be inferred to reflect learning about the properties of the repeated stimulus when followed by increased orienting to a novel stimulus (i.e., novelty detection). Habituation and novelty detection paradigms have been used for over 40 years to study perceptual and mnemonic processes in the human infant, yet important questions remain about the nature of these processes in infants. The aim of the present study was to examine the neural mechanisms underlying habituation and novelty detection in infants. Specifically, we investigated changes in induced alpha, beta, and gamma activity in 6-month-old infants during repeated presentations of either a face or an object, and examined whether these changes predicted behavioral responses to novelty at test. We found that induced gamma activity over occipital scalp regions decreased with stimulus repetition in the face condition but not in the toy condition, and that greater decreases in the gamma band were associated with enhanced orienting to a novel face at test. The pattern and topography of these findings are consistent with observations of repetition suppression in the occipital-temporal visual processing pathway, and suggest that encoding in infant habituation paradigms may reflect a form of perceptual learning. Implications for the role of repetition suppression in infant habituation and novelty detection are discussed with respect to a biased competition model of visual attention.
Kelly A Snyder; Andreas Keil
Related Documents :
9833656 - Late onset canonical babbling: a possible early marker of abnormal development.
1446546 - Integration of sequential information for shape perception by infants: a developmental ...
18588716 - Segmental properties of input to infants: a study of korean.
15819756 - Can chimpanzee infants (pan troglodytes) form categorical representations in the same m...
20688866 - Understanding and managing breast milk jaundice.
10555646 - A multi-institutional study of factors associated with fetal death in injured pregnant ...
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of cognitive neuroscience     Volume:  20     ISSN:  0898-929X     ISO Abbreviation:  J Cogn Neurosci     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-17     Completed Date:  2009-04-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8910747     Medline TA:  J Cogn Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2137-52     Citation Subset:  IM    
Department of Psychology, University of Denver, Denver, CO 80208, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Analysis of Variance
Attention / physiology*
Brain Mapping
Electroencephalography* / methods
Functional Laterality
Habituation, Psychophysiologic / physiology*
Pattern Recognition, Visual / physiology
Photic Stimulation
Reaction Time
Signal Detection, Psychological / physiology*
Spectrum Analysis
Grant Support

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

Previous Document:  Inferences during story comprehension: cortical recruitment affected by predictability of events and...
Next Document:  Dissociating early and late error signals in perceptual recognition.