Cartoon by Don Mayne www.researchcartoons.com
Full-size image for printing (right mouse click and save file)
There are two obvious things wrong with the pictured situation. 1. If you know potential participants will be nervous about a component of a project it is never okay to delay the reveal until after they have signed the consent form. 2. The implication here is that participants can’t change their minds after they have provided their consent.