Affidavit of Dr. Jay Katz
Dr. Jay Katz, Professor (Adjunct) of Law and Psychiatry at Yale University and Attending
Psychiatrist at the Yale New Haven Medical Center, gave a sworn affidavit to the Clay Shaw defense
team on the dangers of testimony obtained under hypnosis.
In recent years, I have become especially interested in the study of
the relationship of hypnosis and hypnotizability to credibility. I
recently conducted an experiment demonstrating how a fiction can be
implanted into a normal person via hypnosis. Even out of the trance
state, he believed it with the conviction of a true fact . . . . Upon
the basis of my training, study and experience I conclude the
following: Hypnosis is a state of intense and sensitive interpersonal
relatedness characterized by nonrational submission and relative
abandonment of executive (ego) control. Heightened suggestibility
(i.e., inclination to believe what others desire him to believe) is
perhaps the most salient characteristic of the state of
hypnosis. . . . There is a close correlation between a subject's
suggestibility in a normal, non-hypnotic state and his
hypnotizability. Persons who are not hypnotizable tend to be the least
suggestible element of the population. Persons who may be induced in a
deep trance tend to be among the most suggestible. . . . False ideas
and beliefs can be implanted upon the mind of a subject who is in a
trance without any intent on the part of the questioner to implant
such beliefs, if the subject thinks that the examiner, or hypnotizer
desires him to entertain such beliefs or if such beliefs seem to him
to be necessary to support other beliefs or to please the hypnotizer
or whomever he represents. The ease with which such implantation can
occur varies with the hypnotizability of the subject. . . . Induction
of a trance may alter the relationship between the subject and the
hypnotizer so that the subject is more open to suggestion by the
hypnotizer (or one whom the subject identifies with him) in subsequent
interrogations outside the trance state. . . . Once a subject is
hypnotized he may continue to be in a trance for months thereafter,
although he may not appear to an untrained observer to be in a trance.
The subject may also have a previous trance reactivated months after
he has, according to all normal criteria, come completely out of the
previous trance. Compliance with a so-called "post-hypnotic
suggestion" is an example of such trance reactivation. It may occur
long after the initial trance and will often not be apparent to the
observer. (James Kirkwood, American Grotesque, pp. 152-153).
You may wish to see:
Return to Kennedy Assassination Home Page