Syndrome-specific deficits of performance and effects of practice on arm movements with deafferentation due to posterior thalamic lesion.

Abstract:

:Aiming and tapping movements were analysed repeatedly over a three-week period in a patient who was hemideafferented due to an ischaemic posterior thalamic lesion. Contrasting behaviour observed in six healthy subjects, nine hemiparetic patients and one patient with hemianopic stroke, allowed the determination of behavioural deficits related to deafferentation. Finger tapping was not impaired specifically and did not improve with practice in the deafferented patient. When aiming movements were investigated, accuracy of the first, largely preprogrammed, phase of movement and timing of the late homing-in phase were impaired specifically in the deafferented patient. Practice led to a step-like change in preprogramming amplitude of the ballistic movement component, a gradual improvement of temporal efficiency of the early movement phase and a more marked improvement of the homing-in phase. Qualitatively comparable but quantitatively less marked effects of practice were documented for hemiparetic patients. These results demonstrated that deafferentation affects preprogrammed aspects of movement and those influenced by current control and that motor learning is possible with central deafferentation, even for aspects of performance that are impaired specifically. It is postulated that motor learning was mediated by changes in strategy (motor programming) and improved efficiency of intact motor control processes (visuomotor control).

journal_name

Behav Neurol

journal_title

Behavioural neurology

authors

Platz T,Mauritz KH

doi

10.3233/BEN-1997-10103

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

15-9

issue

1

eissn

0953-4180

issn

1875-8584

pii

F51T22M23V6406M6

journal_volume

10

pub_type

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