Dear Donald,
sorry for being imprecise!
In more detail: Each session equates a different treatment and each participant underwent each treatment/session. In every session/treatment participants viewed pictures eliciting e.g. fear and neutral images (fear pictures presented in session 1 = fear1, fear pictures presented in session 2 = fear2, and so on). Aside from the flexiblefactorial approach, would it be valid to build a contrast (e.g. fear1 - fear2) in the first-level and forward it into a one-sample t-test or do we have to include also the neutral condition (fear1 - neutral1) - (fear2 - neutral2)?
Thank you very much for your insights!
Kind regards,
Albert