By default the group option should be 1, meaning that there is only one group, or it could be None, meaning that all voxels should be treated independently.

The script automatically and randomly selects the timepoints for the neuronal event simulations. However, sometimes it raises a numpy error that is the following one:

Traceback (most recent call last): File "fMRIsim.py", line 116, in <module> main(sys.argv[1:]) File "fMRIsim.py", line 90, in main sim.simulate() File "/Users/enekourunuela/fmrisim/simulate.py", line 223, in simulate np.ceil(0.05 * self.nscans), self.max_length) File "mtrand.pyx", line 630, in numpy.random.mtrand.RandomState.randint File "bounded_integers.pyx", line 1228, in numpy.random.bounded_integers._rand_int64 ValueError: low >= high