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NAVICULAR BONE. Synonym for scaphoid (q.v.) bone.
NEGATIVE WORK. Work performed with the assistance of gravity as in the lowering of an object or a body segment. Its muscular effort mainly stresses the control of the load rather than the power required in lifting. Its effort is usually rated at from 1/3 to 1/2 of that of positive work (q.v). One of the elements of a lifting task (q.v.).
NEUROPATHY. Pathology of a nerve trunk of varied etiology. Pain, paralysis, muscle atrophy, numbness, and loss of reflexes may occur in areas supplied by the involved nerve. Neuropathy may be due to injury, exposure to harmful chemicals, infection, compression of a nerve, or poisoning by heavy metals. It may also result from a generalized disease such as diabetes.
NON-POSITIVE TACTILE STIMULI. The cessation of feedback signal from the tactile sensors to the brain. For example, if one is sliding an object along a surface toward a hole without looking at it, a non-positive tactile stimulus will be obtained when the object falls into the hole indicating that the task has been successfully completed.
NYSTAGMOGRAM. A recording of the quick rhythmic oscillations of the eyeballs usually known as saccadic eye movements. These oscillations are typically involuntary and can be either horizontal, vertical or rotary. The recordings are a good indicator of the effects of rotation on postural controls as maintained by the semicircular canals and also on the effectiveness of eye scanning (q.v.) as opposed to head scanning (q.v.).
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