Critics have written Schmidt's experiments in parapsychology have not been replicated. Schmidt worked alone with no one checking his experiments. He was accused of being a careless experimenter. The psychologist
C. E. M. Hansel found flaws in all of Schmidt's experiments into clairvoyance, precognition and psychokinesis. Hansel found that necessary precautions were not taken, there was no presence of an observer or second-experimenter in any of the experiments, no counterchecking of the records and no separate machines used for high and low score attempts. There were weaknesses in the design of the experiments that did not rule out the possibility of trickery. There was little control of the experimenter and unsatisfactory features of the machine employed. According to the physicist
Victor Stenger "While Schmidt claims positive results, his experiments also lack adequate statistical significance and have not been successfully replicated in the thirty-five years since his first experiments were reported." The psychologist
James Alcock wrote that he found "serious methodological errors" throughout Schmidt's work which rendered his conclusions of psychokinesis untenable. This included criticism of Schmidt acting both as experimenter and subject and lack of clarification and detail from his reports such as the possibility of optional stopping during the experiments. Schmidt has also drawn criticism for endorsing the psychic claims of
Uri Geller. ==See also==