Abstract

Outlines the types of E effects that occur in parapsychological research. A distinction is drawn between those effects that seem to be mediated by psychological variables and those that result from extrasensory processes. The term "psi experimenter effect" is introduced to refer to unintentional psi which affects experimental outcomes in ways that are directly related to the E's needs, wishes, expectancies, or moods. Several channels for the operation of psi E effects are discussed, as well as numerous studies which support their existence. A review of the literature suggests that E psychokinesis can influence laboratory investigations of psychokinesis and precognition. In addition, psi E effects are indicated in studies showing variations in the Ss' reactions to different Es and in studies involving unintentional psi tasks. (5 p ref)