the PicturesForChkNormalization of some subject had some black dots

i have a quetion. one is that the PicturesForChkNormalization of some subject  had some black dots. what is it? how

does it occur? does these subject has problem with their brain?

 

 

 

Hi,

Please see http://rfmri.org/comment/2842#comment-2842

Best,

Chao-Gan