Zou Qihong, Long Xiangyu, Zuo Xinian, Yan Chaogan, Zhu Chaozhe, Yang Yihong, Liu Dongqiang, He Yong, Zang Yufeng
State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, China.
Hum Brain Mapp. 2009 Sep;30(9):3066-78. doi: 10.1002/hbm.20728.
The thalamus and visual cortex are two key components associated with the alpha power of electroencephalography. However, their functional relationship remains to be elucidated. Here, we employ resting-state functional MRI to investigate the temporal correlations of spontaneous fluctuations between the thalamus [the whole thalamus and its three largest nuclei (bilateral mediodorsal, ventrolateral and pulvinar nuclei)] and visual cortex under both eyes open and eyes closed conditions. The whole thalamus show negative correlations with the visual cortex and positive correlations with its contralateral counterpart in eyes closed condition, but which are significantly decreased in eyes open condition, consistent with previous findings of electroencephalography desynchronization during eyes open resting state. Furthermore, we find that bilateral thalamic mediodorsal nuclei and bilateral ventrolateral nuclei have remarkably similar connectivity maps, and resemble to those of the whole thalamus, suggesting their crucial contributions to the thalamus-visual correlations. The bilateral pulvinar nuclei are found to show distinct functional connectivity patterns, compatible with previous findings of the asymmetry of anatomical and functional organization in the nuclei. Our data provides evidence for the associations of intrinsic spontaneous neuronal activity between the thalamus and visual cortex under different resting conditions, which might have implications on the understanding of the generation and modulation of the alpha rhythm.
丘脑和视觉皮层是与脑电图α波功率相关的两个关键组成部分。然而,它们的功能关系仍有待阐明。在此,我们采用静息态功能磁共振成像来研究在双眼睁开和闭眼条件下,丘脑[整个丘脑及其三个最大的核团(双侧背内侧核、腹外侧核和枕核)]与视觉皮层之间自发波动的时间相关性。在闭眼条件下,整个丘脑与视觉皮层呈负相关,与对侧丘脑呈正相关,但在睁眼条件下这些相关性显著降低,这与先前关于睁眼静息状态下脑电图去同步化的研究结果一致。此外,我们发现双侧丘脑背内侧核和双侧腹外侧核具有非常相似的连接图谱,并且与整个丘脑的图谱相似,表明它们对丘脑 - 视觉相关性具有关键作用。我们发现双侧枕核显示出独特的功能连接模式,这与先前关于这些核团解剖和功能组织不对称性的研究结果相符。我们的数据为不同静息条件下丘脑与视觉皮层之间内在自发神经元活动的关联提供了证据,这可能对理解α节律的产生和调节具有启示意义。