This paper is concerned entirely with problems involving the clinical estimation of rigidity, specifically in patients who have Parkinson's disease or are suspected of having this condition. By clinical estimation is meant the various manipulations and techniques used by the neurologist in the standard neurological examination and some speCial tests particularly designated to measure rigidity. It does not concern any of the techniques involving apparatus for measuring resistance of muscles passively or any of the computer or electronic equipment reported in other sections of this volume for the quantitative measurement of this state.
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Robert S. Schwab (1964) studied this question.