Archive image from page 160 of Directions for laboratory work in Directions for laboratory work in physiology for the use of medical students directionsforlab00lomb Year: 1914 THU 131 middle of the striking face will just touch the skin over the middle of the ligamentum patellae, and so that the blow will be struck at right angles to the ligament. Ordiiiarv clothing will not interfere with results. Make this adjustment with great care, then clamp the rod supporting the hammer. Fig. 28. Method of supporting thigh and foot and of recording the swing of the lower leg in the knee-
Archive image from page 160 of Directions for laboratory work in Directions for laboratory work in physiology for the use of medical students directionsforlab00lomb Year: 1914 THU 131 middle of the striking face will just touch the skin over the middle of the ligamentum patellae, and so that the blow will be struck at right angles to the ligament. Ordiiiarv clothing will not interfere with results. Make this adjustment with great care, then clamp the rod supporting the hammer. Fig. 28. Method of supporting thigh and foot and of recording the swing of the lower leg in the knee-jerk experiment. A, support under thigh ; B, pulley ; C, cross shaped writing needle ; D, rubber band, twisted so as to keep point of needle against drum; 'E,, knee-jerk hammer. Experiment.—Four students work together, each taking his turn as subject, experimenter, assistant, and clerk. The experimenter uses the hammer; the assistant sits near the head ot the subject and applies the sensory or psychic stimuli when signaled by the experimenter; the clerk looks after the drum, and keeps record of any reenforcing or inhibiting stimuli, marking on the drum, i, 2, 3, etc., to cor- respond to his notes. During the entire experiment the subject must be completely relaxed and the room perfectly quiet. Success depends entirely on the contrast between repose and action of the central nervous system. If those who make the experiment are not cjuiet and annoy or excite the subject, except when a special effect is desired, the whole experiment fails.
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