Positive symptoms include those that increase muscle activity through hyper-excitability of the stretch reflex ( i . e ., rigidity and spasticity ) where negative symptoms include those of insufficient muscle activity ( i . e . weakness ) and reduced motor function.
22.
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 .
23.
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 .
24.
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 ".
25.
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 ".
