Phase resetting and frequency entrainment of essential tremor
Identifieur interne : 001F62 ( Main/Merge ); précédent : 001F61; suivant : 001F63Phase resetting and frequency entrainment of essential tremor
Auteurs : Rodger Elble [États-Unis] ; Christopher Higgins [États-Unis] ; Larry Hughes [États-Unis]Source :
- Experimental Neurology [ 0014-4886 ] ; 1992.
Abstract
Step and sinusoidal forcings were delivered to the wrists of 10 patients with advanced essential tremor using a computer-controlled torque motor. Consistent (type 0) phase resetting was produced in only 5 patients, whereas all 10 patients exhibited harmonic and 2: 1 subharmonic entrainment of essential tremor. These results indicate that the oscillator of essential tremor is coupled to the stretch-reflex arc. Irregularity in the tremor rhythm and postperturbation mechanical-reflex oscillations obscured the phase of essential tremor, thereby impeding the computation of phase resetting curves. Sinusoidal forcings circumvented these problems, but frequency entrainment was produced only by forcings at frequencies within ±1 Hz of the tremor frequency and its second harmonic. Resonance accompanied frequency entrainment and probably plays a role in the clinical expression of tremor.
Url:
DOI: 10.1016/0014-4886(92)90014-H
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