Document Detail


Sensitivity to first- and second-order drifting gratings in 3-month-old infants.
MedLine Citation:
PMID:  23145237     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
In two experiments, we investigated 3-month-old infants' sensitivity to first- and second-order drifting gratings. In Experiment 1 we used forced-choice preferential looking with drifting versus stationary gratings to estimate depth modulation thresholds for 3-month-old infants and a similar task for a comparison group of adults. Thresholds for infants were more adult-like for second-order than first-order gratings. In Experiment 2, 3-month-olds dishabituated to a change in first-order orientation, but not to a change in direction of first- or second-order motion. Hence, results from Experiment 1 were likely driven by the perception of flicker rather than motion. Thus, infants' sensitivity to uniform motion is slow to develop and appears to be driven initially by flicker-sensitive mechanisms. The underlying mechanisms have more mature tuning for second-order than for first-order information.
Authors:
Vickie Armstrong; Daphne Maurer; Dave Ellemberg; Terri L Lewis
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Publication Detail:
Type:  Journal Article     Date:  2011-08-08
Journal Detail:
Title:  i-Perception     Volume:  2     ISSN:  2041-6695     ISO Abbreviation:  Iperception     Publication Date:  2011  
Date Detail:
Created Date:  2012-11-12     Completed Date:  2012-11-13     Revised Date:  2013-05-30    
Medline Journal Info:
Nlm Unique ID:  101574031     Medline TA:  Iperception     Country:  England    
Other Details:
Languages:  eng     Pagination:  440-57     Citation Subset:  -    
Affiliation:
Department of Psychology, Neuroscience & Behaviour, McMaster University, Hamilton, ON, Canada, L8S 4K1; e-mail: vickiearmstrong@gmail.com.
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