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Averaging, not internal noise, limits the development of coherent motion processing.
MedLine Citation:
PMID:  25160679     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The development of motion processing is a critical part of visual development, allowing children to interact with moving objects and navigate within a dynamic environment. However, global motion processing, which requires pooling motion information across space, develops late, reaching adult-like levels only by mid-to-late childhood. The reasons underlying this protracted development are not yet fully understood. In this study, we sought to determine whether the development of motion coherence sensitivity is limited by internal noise (i.e., imprecision in estimating the directions of individual elements) and/or global pooling across local estimates. To this end, we presented equivalent noise direction discrimination tasks and motion coherence tasks at both slow (1.5°/s) and fast (6°/s) speeds to children aged 5, 7, 9 and 11 years, and adults. We show that, as children get older, their levels of internal noise reduce, and they are able to average across more local motion estimates. Regression analyses indicated, however, that age-related improvements in coherent motion perception are driven solely by improvements in averaging and not by reductions in internal noise. Our results suggest that the development of coherent motion sensitivity is primarily limited by developmental changes within brain regions involved in integrating motion signals (e.g., MT/V5).
Authors:
Catherine Manning; Steven C Dakin; Marc S Tibber; Elizabeth Pellicano
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-8-1
Journal Detail:
Title:  Developmental cognitive neuroscience     Volume:  10C     ISSN:  1878-9307     ISO Abbreviation:  Dev Cogn Neurosci     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-8-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101541838     Medline TA:  Dev Cogn Neurosci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  44-56     Citation Subset:  -    
Copyright Information:
Copyright © 2014 The Authors. Published by Elsevier Ltd.. All rights reserved.
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