I tried to reproduce your subject.mat files. I understand one colonn by time-series and region. I extracted (using marsbar and my data) the Bold signal in each region and I found higher values (300, 350, etc..) that correspond to intensity values.
I would like to know what represent exactly the values in your subject1.mat file. I found these values very low (0.0014, 0.00085, 0.0020, etc..).