00:01
A participant's agreement to take part in a study after being told what to expect is a, participant bias, b, placebo effect, c, informed consent, or d, debriefing.
00:13
Okay, so a and b are, well, b especially is irrelevant.
00:17
B, the placebo effect, this is where you have something that should not cause an effect, for example, a saline injection, but it causes an effect because of the patient's belief that it will.
00:29
And placebo is a positive effect.
00:32
For example, perhaps they're told it's a painkiller and they experience pain relief.
00:37
So not what we're looking at.
00:39
Participant bias is where your participants have some kind of factor that causes them to be not representative of a general population.
00:49
For example, if you are doing a survey on psychology and you are asking psychology students, you're likely to experience some participant bias there...