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1 2008

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Digitalized drawing test (DDT) – the tool for an early subclinical motor symptoms diagnosis

Gorzelańczyk E. J., Włodarczyk K., Laskowska E., Kunc M., Jelonek J.

Bio-Algorithms and Med-Systems

2008

Vol. 4, no. 8

93--99

Motor functioning is linked with cortico-subcortical circuits and can be the biological marker of some disorders. Motor and tension disorders of specific muscles can be monitored during drawing test completion. The advantage of computer aided tests is that they allow to perform mathematical and statistical analysis. By analyzing primary movements parameters and spectrograms of hand tremor during a drawing test, the researcher obtains a diagnostic data set. A digitalized drawing test consists of a pattern (designed by Edward Jacek Gorzelańczyk) on a piece of paper with special figures. Each shape is of diagnostic value for certain motor abilities (precise movement, muscle tone, kinetics of whole hand/arm). A PC digital tablet with an electro-magnetic ballpen allows to register digital data during the test. The application Med Tablet, co-designed by the author of this article, is used to store and analyze the obtained data. Alcohol or other psychoactive substance addiction gives specific tremors that can be observed in a momentary velocity profile. The profile can also contribute to Parkinson’s disease or intention tremor distinction. What is more, motor disorders can be diagnosed in the preclinic phase of the disease. This digitalized drawing test was also used to evaluate the level of thalamotomy or pallidotomy. A tremor affecting any area of the body is transmitted to hand during the drawing task. Digitalized drawing test can become a subclinical motor symptoms diagnostic tool in PD, addiction and motor dysfunctions in other diseases.