cogwheel phenomenon

cog·wheel phe·nom·e·non

a sudden brief halt in usually smooth respiration or other motor activity.
Synonym(s): Negro phenomenon
A circular jerking rigidity in flexion and extension in a background of tremor, which continues throughout an entire range of movement, a finding typical of parkinsonism; it may also be ‘smoothly’ rigid, in which case it is termed lead pipe rigidity

cogwheel phenomenon

Neurology A circular jerking rigidity in flexion and extension in a background of tremor, which continues throughout an entire range of movement, a finding typical of parkinsonism; it may also be 'smoothly' rigid, and termed lead pipe rigidity. Cf Clasp knife phenomenon, Gegenhalten.

Negro,

Camillo, Italian neurologist, 1861-1927.
Negro cogwheel rigidity - Synonym(s): Negro phenomenon
Negro phenomenon - a sudden brief halt in usually smooth respiration or other motor activity. Synonym(s): cogwheel phenomenon; Negro cogwheel rigidity; Negro rigidity
Negro rigidity - Synonym(s): Negro phenomenon
References in periodicals archive ?
From a somatic perspective, the patient displays cogwheel phenomenon and the Noica sign, urinary incontinence, oscillatory blood pressure, tachycardia, sialorrhea, muscle stiffness, deglutition disturbances, subfebrility (37,6C).
The patient was in a good general state; cogwheel phenomenon and Noica sign absent; he responded to stimuli and to questions; he ate on his own.
Upper extremities showed rigidity with cogwheel phenomenon. Conversely, lower extremities showed spasticity with bilateral Babinski sign.