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Functional connectivity patterns of ERPs activity during the generation of global and local imagery


Global and local visual processing are well established, but the literature on global and local imagery processing is sparse. To analyze the organization of functional connectivity of event-related potentials (ERPs) activity during the generation of global and local imagery, we evaluated the spatial patterns of ERPs correlation between all possible pairs of electrodes (60) placed over the scalp of 28 healthy young normal subjects participating in a global/local imagery generation task using two graph theoretical measures: the clustering coefficient and average path length [13].

Results and discussion

Results showed that the functional network of global imagery generation produced a shorter average path length, while that of local imagery generation got a larger clustering coefficient. Furthermore, the average distance between functional connected electrodes was longer in the generation of global imagery than in local imagery. We suggested that the difference of functional connectivity patterns might reflect the different processing modes of the generation of global and local imagery that global imagery emphasized particularly on global integration, while local imagery on local specialization.


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This work was supported by NSFC 30670699, NCET-06-0277 and the James S. Bower Foundation.

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Correspondence to Yiyuan Tang.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sui, D., Zhao, Q. & Tang, Y. Functional connectivity patterns of ERPs activity during the generation of global and local imagery. BMC Neurosci 10 (Suppl 1), P71 (2009).

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