Definition, analysis and genesis of tremor
A definition of tremor is of importance because good definitions aid our approach to measurement. An exhaustive review of definitions of tremor is given by Brumlik and Yap (1970). Since there is considerable agreement, it would be pointless here to recapitulate the various viewpoints so the following is a distillation. The appearance of tremor is that of a rhythmical movement of a part of the body. This appearance implies that the movement has a relatively fixed periodicity and possesses an amplitude and waveform which are to some extent invariable over reasonable amounts of time. If these characteristics do not hold then movements have an irregular appearance and historically have been classified as different phenomena.
KeywordsEssential Tremor Coherence Function Postural Tremor Physiological Tremor Tremor Amplitude
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