[Eeglablist] Problem of Study Design: not all subjects have same number of condition

[N J]

Hello,

In my dataset, there are 4 condition.

However, not all subject encountered those 4 condition, which means some
just only have 2 or 3 of those condition.

Therefore, when I create simple ERP study with 10 subject and 4 conditions,
I meet an error.

(I guess it is because I didn’t fill all the blocks. But the number of
condition in each subject is originally different.)

How could I solve this problem?

And there’s another problem.
How can I do ERP if I just have only one epoch in some dataset?

Thanks

Best regards,
Joe