Spatio-temporal tuning of coherent motion evoked responses in 4-6 month old infants and adults.
Spatio-temporal tuning of coherent motion evoked responses in 4-6 month old infants and adults.
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DOI：
10.1016/j.visres.2009.08.007
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发表时间：
2009-10
期刊：
影响因子：
1.8
通讯作者：
Norcia, A. M.
中科院分区：
文献类型：
--
作者：
Hou, C.;Gilmore, R. O.;Pettet, M. W.;Norcia, A. M.
运动提示提供了有关观察者在环境中的平移以及对象和表面的移动的丰富信息来源。虽然运动方向可以局部提取，但这些局部测量通常不足以确定物体和表面运动。为了研究局部和全局运动处理机制的发展，我们记录了视觉诱发电位(VEP)，以响应在0.8赫兹的相干旋转运动和随机运动之间交替的动态随机点显示。我们通过记录一系列的点位移和时间更新率，比较了4-6个月大的婴儿和成人的诱发反应的时空调谐。在相干运动调制频率下记录的反应被调整为在两个成人婴儿的枕中线上的位移。在成人中，侧电极上的反应是根据速度进行调整的，但在婴儿中则不是。与成人相比，婴儿的反应在较大的空间位移范围内最大。相比之下，以点更新率记录的反应显示，婴儿和成年人的参数位移调节和头皮地形图更相似。综上所述，我们的结果表明，虽然局部运动加工在4-6个月时相对成熟，但全局整合机制在这个年龄段表现出显著的不成熟。
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 month 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.
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影响因子：
2.5
作者：
HUBEL, DH;WIESEL, TN
通讯作者：
WIESEL, TN
影响因子：
5.3
作者：
Chino, YM;Smith, EL;Cheng, H
通讯作者：
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影响因子：
1.8
作者：
Hou, Chuan;Pettet, Mark W.;Norcia, Anthony M.
通讯作者：
Norcia, Anthony M.
DOI：
10.1073/pnas.70.5.1353
发表时间：
1973-01-01
影响因子：
11.1
作者：
CYNADER, M;BERMAN, N;HEIN, A
通讯作者：
HEIN, A
影响因子：
2.5
作者：
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通讯作者：
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