On this view, the end product of adaptation to an ORD is a recalibration of proprioceptive position sense at one or more points of articulation in the body (see the entry on  bodily awareness). As you practice reaching for a target while wearing laterally displacing prisms, for example, the muscle spindles, joint receptors, and Golgi tendon organs in your shoulder and arm continue to generate the same patterns of action potentials as before, but the proprioceptive and kinaesthetic meaning assigned to them by their “consumers” in the brain undergoes change: whereas before they signified that your arm was moving along one path through the seven-dimensional space of possible arm configurations (the human arm has seven degrees of freedom: three at the wrist, one at the elbow, and three at the shoulder), they gradually come to signify that it is moving along a different path in that kinematic space, namely, the one consistent with the prismatically distorted visual feedback you are receiving. Similar recalibrations are possible with respect to sources of information for head and eye position. After adapting to laterally displacing prisms, signals from receptors in your neck that previously signified the alignment of your head and torso, for example, may come to signify that your head is turned slightly to the side. For discussion, see Harris 1965, 1980 and Welch 1978: chap. 3.