Hello Zheng, The baseline intensity is the intensity of the image without the extra T2* weighting due to BOLD. Best, Ivana On 7 Apr 2010, at 19:46, Zheng Liu wrote: > Hi all, > > When use POSSUM to simulate fMRI signal, what's the default value of > baseline intensity S0? > > Thanks, > > -- > Dr. Zheng Liu > Postdoctoral student in Computer Vision and Image Analysis Lab > Department of Electrical and Computer Engineering > Texas Tech University, Lubbock, TX 79409