Expressing unconscious general knowledge using Chevreul's pendulum.

Can unconscious knowledge be elicited by ideomotor action when the knowledge fails to be elicited by verbal reports? Using an Ouija board, previous research found ideomotor action produced substantial accuracy for general knowledge questions previously rated as pure "guesses," and for which later verbal reports produced accuracy close to chance. We replicated the procedure substituting Chevreul's pendulum rather than an Ouija board. We found that questions whose answer was previously rated as a guess, were answered equally well and at about chance levels by ideomotor action and verbal responses. Thus, one cannot presume that ideomotor action rather than verbal report will allow greater knowledge to be expressed in any particular context, including therefore the hypnotherapy one. An ideomotor action may elicit only conscious knowledge. Further research is recommended to clarify this important issue.