You suspect perseveration of posture in a patient. Before revealing the answer, decide how you would assess for this.

Passively move one of the patient's limbs into an unusual position and note carefully whether any resistance is felt during the movement itself, since perseveration of posture characteristically involves none. Release the limb and note whether the muscles can be felt to actively contract and fix it in the new position, confirming active maintenance rather than passive floppiness. Time how long the posture is maintained without any explicit instruction to hold it, since perseveration of posture is characteristically sustained for at least a minute and often considerably longer. Note whether this occurs together with obstruction, in which a partly completed voluntary action is similarly maintained in its mid-flight position.