demand characteristics and investigator effects

Question 1

what are demand characteristics?

Answer 1

any cue from the researcher or from the research situation that may be interpreted by ppts as revealing the purpose of the investigation, which could lead to a ppt changing their behaviour within the research situation

Question 2

what are investigator effects?

Answer 2

any effect of the investigator’s behaviour on the research outcome, this can include everything from the design to the selection/interaction of/with ppts