Development of directional motion symmetry in the monocular visually evoked potential of infant monkeys
Development of directional motion symmetry in the monocular visually evoked potential of infant monkeys
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DOI：
10.1016/s0042-6989(97)00289-7
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发表时间：
1998-05-01
期刊：
影响因子：
1.8
通讯作者：
Boothe, RG
中科院分区：
文献类型：
--
作者：
Brown, RJ;Wilson, JR;Boothe, RG
在人类和猴子的运动过程中表现出方向不对称性在婴儿期，这是不存在于成年人，除了以下异常的视觉饲养条件。为了表征对称反应成熟的时间过程，我们测量了单眼视觉诱发电位（MVEP）响应0.26 C/度光栅水平振荡在6 Hz的13个婴儿恒河猴1和52周龄之间。使用傅立叶分析从MVEP提取非对称（F1）和对称（F2）频率分量。在早期年龄，从两只眼睛测量的不对称F1分量表现出180度的眼间相移，表明在左眼和右眼之间存在相反方向的方向偏差。虽然我们的方法不能确定是否在鼻或颞方向的偏见，我们的结果将是一致的鼻偏见，已经观察到在以前的运动研究。不对称性的大小以不对称性指数F1/（F1 + F2）的形式量化。基于不对称性指数的发育变化以及F1和F2的相位和幅度，我们得出结论，MVEP在6周龄时失去了方向不对称性。在前6周内在猴子中观察到的定向运动对称性的发展与在前5个月内在人类中观察到的相似。(C)1998爱思唯尔科学有限公司，保留所有权利。
Motion processing in humans and monkeys exhibit a directional asymmetry during infancy which is not present in adults except following abnormal visual rearing conditions. To characterize the time course for maturation of a symmetric response, we measured the monocular visually evoked potential (MVEP) response to 0.26 c/deg gratings oscillating horizontally at 6 Hz in 13 infant rhesus monkeys between 1 and 52 weeks of age. An asymmetric (F1) and a symmetric (F2) frequency component were extracted from the MVEP using Fourier analysis. At early ages the asymmetric Fl component measured from the two eyes exhibited a 180 deg interocular phase shift, demonstrating that there was a directional bias in opposite directions between the left and right eyes. Although our methods could not determine whether the bias was in the nasal or temporal direction, our results would be consistent with a nasal bias, as has been observed in previous motion studies. Magnitude of the asymmetry was quantified in the form of an asymmetry index, F1/(F1 + F2), Based on developmental changes in the asymmetry index, and phases and amplitudes of F1 and F2, we conclude that the MVEP loses its directional asymmetry at 6 weeks of age. The development of directional motion symmetry observed in monkeys over the first 6 weeks is similar to that observed in humans over the first 5 months. (C) 1998 Elsevier Science Ltd, All rights reserved.