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PROCEEDINGS OF THE PHYSIOLOGICAL SOCIETY

Recent work (Eldred, Granit & Merton, 1953) has indicated that the sensory endings in skeletal muscle are length detectors in a closed loop control system which positions the limb. The apparatus shown diagrammatically in Fig. 1 was designed to test the closed-loop hypothesis on the intact human subject. A pull of constant velocity can be applied without warning to 4e abducted arm; arrangements are made to measure the force exerted at the wrist and the e.m.g. activity from skin electrodes over the biceps.