Thank you for these suggestions! I've done as suggested but there is no difference. I've also attached below the input used for sLORETA. I've also tried reimporting the individual trials - running average on the trials - compute sources again but nothing changed either.
Interestingly, some other conditions (e.g. different stimulus intensity) from the same subject also show the same observation of no source activations with stimulus presentation (and with all conditions being equal). Therefore I did some investigation and I've found the following. Below is the error message you get when you try to display the scout time series with the selected scouts (right BA 41 and 42). Perhaps this error message may give some insight as to what is going on...? (or is this just saying that there is nothing to display because there are no displayable source activations?)
