center of gravity MNI coordinates

[Qingfang Liu]

Hi, the "report" function provides both "peak MNI coordinates" and "center of gravity MNI coordinates" for each cluster. I believe that the peak MNI coordinates correspond to the maximum activation within the cluster, but what does "center of gravity MNI coordinates" mean?

Thank you very much,

Qingfang

[Xu Cui]

Qingfang,

Center of gravity MNI coordinate is simply the mean (average) of all voxel coordinates in a cluster. For example, the center of gravity of coordinates [1,3,5] and [2,9,11] is [1.5,6,8].

Xu

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Xu Cui, Ph.D
Department of Psychiatry and Behavioral Sciences
Stanford University
Blog: http://www.alivelearn.net

Profile: http://www.linkedin.com/in/cuixu
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