Tremor and myoclonus.Tremor and myoclonus are two common hyperkinetic movement disorders.  Tremor is characterized by rhythmic oscillatory movements while myoclonic jerks are usually arrhythmic.  Tremor can be classified into subtypes including the most common types: essential, enhanced physiological, and parkinsonian tremor.  Recent developments in tremor point toward a role for intermuscular coherence analysis to differentiate between tremor subtypes. 
Tremor
Tremor and myoclonus.Tremor and myoclonus are two common hyperkinetic movement disorders.  Myoclonus classification is based on its anatomic origin: cortical, subcortical, spinal, and peripheral myoclonus.  In myoclonus, advanced electrophysiologic testing, such as back-averaging, coherence analysis, somatosensory-evoked potentials, and the C-reflex can be of additional value. 
myoclonus
Video-polymyography is the main technique to (sub)classify the involuntary movements. 
video-polymyography
In myoclonus, advanced electrophysiologic testing, such as back-averaging, coherence analysis, somatosensory-evoked potentials, and the C-reflex can be of additional value. 
back-averaging
In myoclonus, advanced electrophysiologic testing, such as back-averaging, coherence analysis, somatosensory-evoked potentials, and the C-reflex can be of additional value.  Recent developments in tremor point toward a role for intermuscular coherence analysis to differentiate between tremor subtypes. 
coherence analysis
In myoclonus, advanced electrophysiologic testing, such as back-averaging, coherence analysis, somatosensory-evoked potentials, and the C-reflex can be of additional value. 
somatosensory-evoked potentials
In myoclonus, advanced electrophysiologic testing, such as back-averaging, coherence analysis, somatosensory-evoked potentials, and the C-reflex can be of additional value. 
C-reflex