From Finkel & Campbell, 2001, JPSP, used as a manipulation check :
At the end of the session, participants completed a ﬁve-item instrument assessing how effortful it had been to comply with the instructions while watching the ﬁlm segment. […] We scored their responses on a scale ranging from 0 (do not agree at all) to 8 (agree completely).
- I exerted a lot of effort while watching the ﬁlm
- I had to concentrate on the instructions while watching the ﬁlm
- I felt emotionally tired after watching the ﬁlm