Roberts refused for her mediumship to be tested or observed by any scientist or psychical researcher.

Which is also the view of most psychical researchers today.

She was closely associated with William Fletcher Barrett, the psychical researcher.

Certainly it is so, in the sense that a man might be a very good psychical researcher but a very bad man.

Before Piper was investigated by psychical researchers she worked as a paid medium at a dollar for each sitting.

Harold Sherman (1898-1987) was a prolific American author, lecturer and psychical researcher.

He wrote that psychical researchers are wrong for endorsing cases of paranormal phenomena as psychological factors can explain them.

Even now, as a psychical researcher, I have trouble with unsubstantiated personal testimony.

"Sorry, Walter," he apologized, and went on to say that psychologists were just as bad as psychical researchers.

When the report was published in English, it was challenged by various psychical researchers.