Reorganization of Visual Cortical Maps after Focal Ischemic Lesions

Reorganization of Visual Cortical Maps after Focal Ischemic Lesions
复制标题

局灶性缺血性病变后视觉皮层图的重组

DOI:
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发表时间:
2003
影响因子:
6.3
通讯作者:
F. Sengpiel
F. Sengpiel
中科院分区:
医学1区
文献类型:
--
作者:
A. Zepeda;L. Vaca;C. Arias;F. Sengpiel

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中枢损伤后的可塑性可能导致感觉输入的皮质表征的重组。周边(视网膜)病变后视觉皮层重组已被广泛研究,但局灶性皮层病变受到较少关注。在这项研究中,我们调查了组织的视网膜和方向偏好地图在不同的时间点后,局灶性缺血性病变的初级视觉皮层(V1)。我们诱导了一个局灶性光化学病变的小猫V1和评估,通过光学成像的内在信号,功能皮质布局后立即和4,13,33,40天后病变。我们分析了组织切片,并评估了功能图的时间变化。组织学分析显示在所有时间点均存在明显病变,病变随时间缩小。影像学结果显示,视网膜病变后,视网膜的视向图和方向偏好图发生了一定程度的重组。在病变附近,一度视空间的皮层视网膜定位表征随时间扩展,同时某些方向域的面积也增加。这些结果表明,不同的皮质表征可以重组后的病变过程,并提出了一种机制,通过该机制,可以发生在皮质受损的患者的皮质暗点填充。
Plasticity after central lesions may result in the reorganization of cortical representations of the sensory input. Visual cortex reorganization has been extensively studied after peripheral (retinal) lesions, but focal cortical lesions have received less attention. In this study, we investigated the organization of retinotopic and orientation preference maps at different time points after a focal ischemic lesion in the primary visual cortex (V1). We induced a focal photochemical lesion in V1 of kittens and assessed, through optical imaging of intrinsic signals, the functional cortical layout immediately afterwards and at 4, 13, 33, and 40 days after lesion. We analyzed histologic sections and evaluated temporal changes of functional maps. Histological analysis showed a clear lesion at all time points, which shrank over time. Imaging results showed that the retinotopic and orientation preference maps reorganize to some extent after the lesion. Near the lesion, the cortical retinotopic representation of one degree of visual space expands over time, while at the same time the area of some orientation domains also increases. These results show that different cortical representations can reorganize after a lesion process and suggest a mechanism through which filling-in of a cortical scotoma can occur in cortically damaged patients.
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期刊: SCIENCE
影响因子: 56.9
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期刊: STROKE
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