The commonly quoted definition by Lance ( 1980 ) describes a motor disorder, characterised by a velocity-dependent increase in tonic stretch reflexes with exaggerated tendon jerks, resulting from hyper-excitability of the stretch reflex as one component of the upper motor neurone ( UMN ) syndrome .
2.
Wolpaw and his colleagues, for example, have shown that training monkeys and rats to alter the size of a simple reflex _ a tendon jerk _ produces lasting changes, both anatomical and physiological, in the spinal cord itself, and the changes persist when connections to the brain are severed.
3.
Lance ( 1980 ) describes it this way : " . . . a motor disorder, characterised by a velocity-dependent increase in tonic stretch reflexes ( muscle tone ) with exaggerated tendon jerks, resulting from hyper-excitability of the stretch reflex as one component of the upper motor neurone ( UMN ) syndrome ".
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