Cortical activation evoked by visual mental imagery as measured by fMRI
Cortical activation evoked by visual mental imagery as measured by fMRI
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DOI：
10.1097/00001756-200012180-00011
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发表时间：
2000-12-18
期刊：
影响因子：
1.7
通讯作者：
Greenlee, MW
中科院分区：
文献类型：
--
作者：
Knauff, M;Kassubek, J;Greenlee, MW
认知神经科学中的一个主要争议是初级视觉皮质及其附近区域是否参与视觉心理表象。在一项功能磁共振研究中，我们检查了10名健康受试者在不同任务条件下的大脑活动：在知觉条件下，受试者看到复杂的几何形状，并必须判断其他突出显示的刺激是在图形内部还是外部。在表象条件下，受试者只看到突出显示的刺激，并被指示想象之前学习的几何形状来解决相同的任务。尽管行为数据显示了基于地形图组织的心理图像所预期的距离效应，但功能成像数据并未显示在成像条件下初级视觉皮质的活动增加。在枕叶皮质，只有视觉联想皮质(BA19)的活动略有增加，而顶叶皮质(BA7和BA40)的活动最高。这项研究的结果不支持初级视觉皮质参与视觉心理意象的假设，而是空间子系统和更高视觉区域的网络似乎参与其中。神经报告11：3957-3962(C)2000 Lippincott Williams&Wilkins.
One of the major controversies in cognitive neuroscience is whether the primary visual cortex and nearby areas are involved in visual mental imagery. In an fMRI study we examined the brain activity of 10 healthy subjects under different task conditions: in the perception condition subjects saw complex geometrical shapes and had to decide whether other highlighted stimuli fell inside or outside the figure. In the imagery condition subjects saw only the highlighted stimuli and were instructed to imagine the previously studied geometrical shapes to solve the same task. Although the behavioral data show a distance effect that would be expected based on topographically organized mental images, the functional imaging data do not show increased activity in the primary visual cortex in the imagery condition. In the occipital cortex a slightly increased activity was found only in the visual association cortex (BA 19), whereas the highest activation was observed in the parietal cortex (BA 7 and 40). The results of the study do not support the assumption that the primary visual cortex is involved in visual mental imagery, but rather that a network of spatial subsystems and higher visual areas appears to be involved. NeuroReport 11:3957-3962 (C) 2000 Lippincott Williams & Wilkins.