Increased variability in spiral drawing in patients with functional (psychogenic) tremor. Hess, C. W., Hsu, A. W., Yu, Q., Ortega, R., & Pullman, S. L. Human Movement Science, 38:15–22, December, 2014. ![Increased variability in spiral drawing in patients with functional (psychogenic) tremor [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Increased variability is a characteristic clinical and physiologic feature of functional (psychogenic) tremor. In this study, we use computerized spiral analysis to show that the variability of a motor task is a quantifiable characteristic of functional tremor. We compare functional tremor patients to phenomenologically similar dystonic tremor patients and to normal controls. We used the spiral severity score, a measure that does not incorporate spiral tightness, as a marker of spiral drawing performance, and inter-spiral tightness variability (based on the 25–75%ile range in tightness across ten spirals) to evaluate the effects of functional tremor on drawing spirals. The spirals of 74 participants: 22 functional tremor, 21 dystonic tremor, and 31 normal controls were analyzed. Spiral severity was higher in both tremor groups compared to controls, but did not differentiate them. Inter-spiral variability, however, was higher in the functional tremor group compared to both other groups. Thus, spiral analysis captures variability of a motor task and may be used as an objective test for functional tremor. The effect of functional tremor in other motor tasks should be investigated.
@article{hess_increased_2014,
title = {Increased variability in spiral drawing in patients with functional (psychogenic) tremor},
volume = {38},
issn = {0167-9457},
url = {http://www.sciencedirect.com/science/article/pii/S0167945714001298},
doi = {10.1016/j.humov.2014.08.007},
abstract = {Increased variability is a characteristic clinical and physiologic feature of functional (psychogenic) tremor. In this study, we use computerized spiral analysis to show that the variability of a motor task is a quantifiable characteristic of functional tremor. We compare functional tremor patients to phenomenologically similar dystonic tremor patients and to normal controls. We used the spiral severity score, a measure that does not incorporate spiral tightness, as a marker of spiral drawing performance, and inter-spiral tightness variability (based on the 25–75\%ile range in tightness across ten spirals) to evaluate the effects of functional tremor on drawing spirals. The spirals of 74 participants: 22 functional tremor, 21 dystonic tremor, and 31 normal controls were analyzed. Spiral severity was higher in both tremor groups compared to controls, but did not differentiate them. Inter-spiral variability, however, was higher in the functional tremor group compared to both other groups. Thus, spiral analysis captures variability of a motor task and may be used as an objective test for functional tremor. The effect of functional tremor in other motor tasks should be investigated.},
urldate = {2019-07-30},
journal = {Human Movement Science},
author = {Hess, Christopher W. and Hsu, Annie W. and Yu, Qiping and Ortega, Robert and Pullman, Seth L.},
month = dec,
year = {2014},
keywords = {Dystonia, Functional, Movement disorders, Psychogenic, Spiral analysis, Spirography, Tremor},
pages = {15--22}
}
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We used the spiral severity score, a measure that does not incorporate spiral tightness, as a marker of spiral drawing performance, and inter-spiral tightness variability (based on the 25–75%ile range in tightness across ten spirals) to evaluate the effects of functional tremor on drawing spirals. The spirals of 74 participants: 22 functional tremor, 21 dystonic tremor, and 31 normal controls were analyzed. Spiral severity was higher in both tremor groups compared to controls, but did not differentiate them. Inter-spiral variability, however, was higher in the functional tremor group compared to both other groups. Thus, spiral analysis captures variability of a motor task and may be used as an objective test for functional tremor. 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