A system is provided for measuring psychological suggestibility components in which certain physical stimuli are applied to a subject's arm or other body part and the subject's reaction is detected. The arm is supported by three parallel bar members, the intermediate member being stationary and the two outside members being moved downwardly to suggest to the subject a downward movement of his arm. In addition, squeezing forces are applied through a flexible and stretchable element extending from one of the outside members over the arm to the other of the outside members. Also, pointed prongs are movable downwardly against the upper surface of the subject's arm to apply uncomfortable pressure thereto. The vertical position of the subject's arm and vertical movement thereof are indicated by lights energized from contact devices associated with certain of the prongs. A cover extends over the subject's arm to shield the mechanism from view and an arrangement is provided in the back of a chair in which the subject sits during testing. A variety of tests may be performed by a lay person according to prescribed procedures with objective results which are independent of any personal relationship between the subject and the person conducting the tests.
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