Search Result for "experimenter bias":
Wordnet 3.0

NOUN (1)

1. (psychology) bias introduced by an experimenter whose expectations about the outcome of the experiment can be subtly communicated to the participants in the experiment; 



WordNet (r) 3.0 (2006):

experimenter bias
    n 1: (psychology) bias introduced by an experimenter whose
         expectations about the outcome of the experiment can be
         subtly communicated to the participants in the experiment