کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4034678 1263473 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spatio-temporal tuning of coherent motion evoked responses in 4–6 month old infants and adults
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
پیش نمایش صفحه اول مقاله
Spatio-temporal tuning of coherent motion evoked responses in 4–6 month old infants and adults
چکیده انگلیسی

Motion cues provide a rich source of information about translations of the observer through the environment as well as the movements of objects and surfaces. While the direction of motion can be extracted locally these local measurements are, in general, insufficient for determining object and surface motions. To study the development of local and global motion processing mechanisms, we recorded Visual Evoked Potentials (VEPs) in response to dynamic random dot displays that alternated between coherent rotational motion and random motion at 0.8 Hz. We compared the spatio-temporal tuning of the evoked response in 4–6 months old infants to that of adults by recording over a range of dot displacements and temporal update rates. Responses recorded at the frequency of the coherent motion modulation were tuned for displacement at the occipital midline in both adults in infants. Responses at lateral electrodes were tuned for speed in adults, but not in infants. Infant responses were maximal at a larger range of spatial displacement than that of adults. In contrast, responses recorded at the dot-update rate showed a more similar parametric displacement tuning and scalp topography in infants and adults. Taken together, our results suggest that while local motion processing is relatively mature at 4–6 months, global integration mechanisms exhibit significant immaturities at this age.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vision Research - Volume 49, Issue 20, 15 October 2009, Pages 2509–2517
نویسندگان
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