 |
 |
Dear Diane, By default SPM will use all the trials to compute the solution unless you tell it not to. In GUI there is a question right after you press the Invert button where you are asked to select the conditions. You can select just one trial there if you indeed gave each trial a distinct label. Whether there is enough information in a single trial to get a meaningful solution is a different question the you'll have to figure out yourself. Best, Vladimir Sent from my iPad On 26 Aug 2010, at 11:41, Diane Whitmer <[log in to unmask]> wrote: > Hello, > I am wondering if anyone has successfully generated meaningful single > trial "induced" responses in EEG data using SPM8? > I generated single trial neuroimages of the alpha rhythm by giving > each trial my dataset a different label, and the inverse solutions > produced were suspiciously similar - differing only in their scale. > This raises the question for me whether there is a bug in the code > whereby all the data are somehow used for computing the solution for a > single trial. > Any insight would be helpful. > Thank you, > Diane