Defective or impaired muscular coordination; difficulty in coordinating muscular movements despite normal muscle strength.
From Greek dys- (bad, abnormal) + ergon (work, action). Unlike paralysis (loss of strength), dysergia involves intact muscles that simply won't coordinate properly, indicating a neurological rather than muscular problem.
Dysergia is the difference between 'I can't move' and 'I can move but I'm clumsy'—it points to brain/nerve problems rather than muscle damage. This distinction revolutionized understanding of stroke, Parkinson's, and cerebral palsy.
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