To clarify the nature of the Experimenter Bias Effect (EBE), the present study attempted to evaluate the influence of experimental demand characteristics and E's investment upon emergence of the EBE. The experimental design consisted of two 2 × 2 factorial designs in which Experimenter Expectancy and Experimenter Investment were each represented on two levels. The Rorschach inkblot test and Number Estimation Test were the tasks used in the two designs. The data did not reflect an EBE with either task or with any combination of experimental conditions. The present findings were discussed in terms of Es' inaccuracies in receiving and/or retaining the stated expectancy, Es' inabilities in identifying the intended demand characteristics, and the unreliable nature of the EBE.
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