Briefly describe Asch's baseline procedure?
He tested 123 American men. Participants were asked to make judgements about lines and were asked which comparison line matched the standard line (they had to say these out loud). One of the comparison lines was always clearly the same as the standard line, the other lines were substantially different from the standard line and clearly wrong.
There was one real participant in each trial, the rest were confederates, they were tested in groups of 6-8. The real participant was always seated last or second to last in the group. The confederates of Asch gave incorrect answers each time.