Document Detail


Transformation of the kinematic characteristics of a precise movement after a change in a spatial task.
MedLine Citation:
PMID:  17763985     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The central mechanism of motor programming was studied using a model of precise horizontal flexion of the arm at the elbow joint. Training was performed in the dark to ensure that formation of the motor program was based predominantly on the use of proprioceptive afferentation. The target was not demonstrated before training: subjects determined the angle of arm flexion during training, the moment at which the target position was reached being identified by a brief LED flash. Subjects had to perform the movement as quickly and accurately as possible. The amplitude, speed, and accuracy of the movement were measured in real time. The ten subjects were divided into two groups for initial training to precise movements, using two different protocols: flexion of the elbow to 70 degrees and to 55 degrees . At the second stage of the experiment, each subject's initial target position was suddenly changed (from 70 degrees to 55 degrees and vice versa). Training was continued until a stable accuracy in the new conditions was achieved (with errors of no more than 5% of the specified amplitude). The nature of the transformation in the kinematics of the precise movement in response to the change in the single task parameter illuminated the fundamental principle of organization of the supraspinal motor command for movements of this type. For both specified flexion amplitudes, the ratio between the acceleration and deceleration phases of the movement were identical during the period of skill fixation. On average, 70% of the total amplitude of flexion was accounted for by the acceleration phase and 30% by the deceleration phase. Adaptation of the precise movement to changes in the specified horizontal elbow flexion angle (i.e., re-achievement of the required movement accuracy in the changed conditions) during rearrangement was completed by inversion of these values. According to the results of previous studies, the most informative measure for analysis of the dynamics of the controlling central command was the acceleration of the movement. In terms of current concepts of the mechanism of motor control, the acceleration plateau can be regarded as mirroring long-term depression--the voltage plateau in Purkinje cells and motoneurons. Data processing involved calculation of the integral acceleration in both phases of the movement in relation to the angle of flexion (phase plots). These data underlie our understanding of the mechanism of transformation of movement kinematics responsible for the formation of a new central command.
Authors:
O N Vasil'eva
Related Documents :
23967935 - Designing sound and visual components for enhancement of urban soundscapes.
1945725 - Induced movement-in-depth and induced changing-size elicited by a luminous rotating spi...
15153405 - Location versus distance in determining movement accuracy.
16245485 - Visual perception of writing and pointing movements.
12676155 - Behavioral arousal blocks light-induced phase advances in locomotor rhythmicity but not...
20711565 - Competitive effects on steady-state visual evoked potentials with frequencies in- and o...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroscience and behavioral physiology     Volume:  37     ISSN:  0097-0549     ISO Abbreviation:  Neurosci. Behav. Physiol.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-09-03     Completed Date:  2007-12-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330471     Medline TA:  Neurosci Behav Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  659-68     Citation Subset:  IM    
Affiliation:
Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow. oxniva@mail.ru
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Adolescent
Adult
Biomechanics
Elbow / innervation
Female
Humans
Male
Mental Processes / physiology*
Models, Biological
Movement / physiology*
Psychomotor Performance / physiology*
Spatial Behavior / physiology*
Transfer (Psychology) / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Anticipatory postural adjustment before bimanual unloading reactions: the role of the motor cortex i...
Next Document:  Characteristics of differential inhibition during selection between food-related and aversive respon...