According to Kao et al NeuroImage 44(3) 2009, m-sequences can be defined
when Q+1 is a prime or a prime power. So 6 or 7 conditions should work
> dear SPMers:
> it seems that most of M-sequence scripts available are
> only useful for event-types of 2,3,5. i want to carry on an experiment
> of 6 different conditions (in addition to a null condition), how can i
> generate an efficient sequence? can i manage using M-squence?
> looking forward to your suggestions.
> thank you all in advance!
> changming chen