کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4316610 1613113 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Averaging, not internal noise, limits the development of coherent motion processing
ترجمه فارسی عنوان
به طور متوسط، نویز داخلی، توسعه پردازش حرکت منسجم را محدود می کند
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
چکیده انگلیسی


• Motion processing abilities develop gradually through childhood.
• This lengthy development could be due to local noise and/or poor averaging.
• 5–11-year-olds and adults performed equivalent noise and motion coherence tasks.
• Through childhood, internal noise reduces and averaging increases.
• Yet, only improved averaging explains developments in motion coherence sensitivity.

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).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Developmental Cognitive Neuroscience - Volume 10, October 2014, Pages 44–56
نویسندگان
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