PMID: 9644294Jun 30, 1998Paper

Pointing to remembered targets in 3-D space in Parkinson's disease

Motor Control
H PoiznerS Adamovich

Abstract

A three-dimensional tracking system was used to examine whether subjects with Parkinson's disease (PD) would show characteristic performance deficits in an unconstrained pointing task. Five targets were presented in a pyramidal array in space to 11 individuals with mild to moderate PD and 8 age-matched controls. After the target was indicated, subjects closed their eyes and pointed to the remembered target locations without vision. Despite the absence of visual feedback during movement, PD subjects were as accurate overall as controls. However, PD subjects showed greater variable errors, more irregular trajectories, and a vertical endpoint bias in which their endpoints were significantly lower than controls. They also showed deficiencies in the compensatory organization of joint rotations to ensure consistency in azimuthal (horizontal) positioning of the arm endpoint. We concluded that, under appropriate task conditions, PD subjects may not show overall deficits in accuracy even when making targeting movements at normal speed without visual feedback. Nevertheless, our findings indicate that there are certain dimensions of performance which are selectively altered in Parkinson's disease even when overall performance is normal.

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Citations

Jul 26, 2005·Experimental Brain Research·Luis F SchettinoHoward Poizner
Dec 6, 2006·Experimental Brain Research·Julie MessierHoward Poizner
Mar 8, 2007·Experimental Brain Research·M LemayF Richer
Apr 8, 2006·Movement Disorders : Official Journal of the Movement Disorder Society·Matthias MaschkeJürgen Konczak
Apr 25, 2014·Journal of Neurophysiology·Joseph SniderHoward Poizner
Mar 29, 2001·Neurorehabilitation and Neural Repair·M E Cheung, S H Broman
Dec 3, 2008·Experimental Brain Research·Natalia DounskaiaCharles H Adler
Sep 23, 2009·Experimental Brain Research·Fang Yang, Anatol G Feldman
Jan 19, 2005·The European Journal of Neuroscience·N L W KeijsersC C A M Gielen
Mar 11, 2021·Experimental Brain Research·Erin K CressmanDenise Y P Henriques
Oct 26, 1999·Neuropsychologia·M E TyroneH Poizner
Nov 15, 2003·Neuropsychologia·Luis F SchettinoHoward Poizner

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