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Batcheldor, K.J. (1984).
Contributions to the Theory of PK Induction from Sitter-Group Work.
Journal of the American Society for Psychical Research, 78(2), p.111.

Discusses insights and observations regarding the operation of psychokinesis (PK) in sitter groups. The adverse effect of light is discussed, but psychological considerations, especially the role of belief, are emphasized. The author distinguishes between "instant" and "long-term" belief, the former being most important as regards PK induction. It is argued that PK success is contagious: Success builds on success. Yet it is not possible to deliberately create the requisite belief--it is involuntary. The role of artifacts, or pseudo-PK, in inducing genuine PK is described. Also dealt with are emotional resistance, which can inhibit phenomena; the optimum psi state (including "divided" and "blended" states); feedback and suggestion; and control over PK ability. He points out that although replications of sitter-group work are called for, those who prefer more laboratory-oriented research should nonetheless be able to apply and test some of the ideas that have emerged from sitter-group work in other areas of psi research. (29 ref)