Some Basic Experiments in Extra-sensory Perception: A Background

Abstract

EXTRA-SENSORY perception, under the headings of “telepathy” and “clairvoyance”2, is not new to science, nor to its psychological branch. Many psychologists have given active attention to it3, and some have contributed to the evidence for its occurrence. Among the latter are Bechterew4, Brugmanns5, Coover6, Estabrooks7, and Janet8. Of these, Coover apparently did not recognize his own contributions at the time, but several critics have since agreed that his results are positive, while Janet has simply remained silent regarding his findings, allowing others to interpret them. The Danish psychologist, Lehmann, who, with Hansen, offered the only serious criticism of the early telepathic studies, later came hirnself to be convinced of its actual occurrence.9