5 ATTEMPTS TO REPLICATE EXPERIMENTER BIAS EFFECT

5 investigations, involving 501 undergraduate Ss and 51 undergraduate Es were conducted to cross-validate a study by R. Rosenthal and K. Fode (see 38:3) which demonstrated the E bias effect (EBE). Each of the 5 studies failed to demonstrate that Es' expectancy-biases influence their results (overall F < 1). The 5 studies are related to other studies in this area, the majority of which also failed to demonstrate the EBE. It is concluded that the effect is more difficult to demonstrate than was implied in several recent reviews and that it is not known now what preconditions are necessary to obtain it. (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.