| Repetition suppression of induced gamma activity predicts enhanced orienting toward a novel stimulus in 6-month-old infants. | |
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MedLine Citation:
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PMID: 18457506 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Kelly A Snyder; Andreas Keil |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cognitive neuroscience Volume: 20 ISSN: 0898-929X ISO Abbreviation: J Cogn Neurosci Publication Date: 2008 Dec |
Date Detail:
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Created Date: 2008-11-17 Completed Date: 2009-04-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8910747 Medline TA: J Cogn Neurosci Country: United States |
Other Details:
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Languages: eng Pagination: 2137-52 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Denver, Denver, CO 80208, USA. ksnyder2@du.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Attention / physiology* Brain Mapping Electroencephalography* / methods Female Functional Laterality Habituation, Psychophysiologic / physiology* Humans Infant Male Pattern Recognition, Visual / physiology Photic Stimulation Reaction Time Repression* Signal Detection, Psychological / physiology* Spectrum Analysis |
| Grant Support | |
ID/Acronym/Agency:
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MH12132/MH/NIMH NIH HHS; NS32976/NS/NINDS NIH HHS; R03-HD049366/HD/NICHD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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