Document Detail


Origins of submovements during pointing movements.
MedLine Citation:
PMID:  18550020     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Submovements that are frequently observed in the final portion of pointing movements have traditionally been viewed as pointing accuracy adjustments. Here we re-examine this long-lasting interpretation by developing evidence that many of submovements may be non-corrective fluctuations arising from various sources of motor output variability. In particular, non-corrective submovements may emerge during motion termination and during motion of low speed. The contribution of these factors and the factor of accuracy regulation in submovement production is investigated here by manipulating movement mode (discrete, reciprocal, and passing) and target size (small and large). The three modes provided different temporal combinations of accuracy regulation and motion termination, thus allowing us to disentangle submovements associated with each factor. The target size manipulations further emphasized the role of accuracy regulation and provided variations in movement speed. Gross and fine submovements were distinguished based on the degree of perturbation of smooth motion. It was found that gross submovements were predominantly related to motion termination and not to pointing accuracy regulation. Although fine submovements were more frequent during movements to small than to large targets, other results show that they may also be not corrective submovements but rather motion fluctuations attributed to decreases in movement speed accompanying decreases in target size. Together, the findings challenge the traditional interpretation, suggesting that the majority of submovements are fluctuations emerging from mechanical and neural sources of motion variability. The implications of the findings for the mechanisms responsible for accurate target achievement are discussed.
Authors:
Laetitia Fradet; Gyusung Lee; Natalia Dounskaia
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2008-06-11
Journal Detail:
Title:  Acta psychologica     Volume:  129     ISSN:  0001-6918     ISO Abbreviation:  Acta Psychol (Amst)     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-08-20     Completed Date:  2008-11-18     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  0370366     Medline TA:  Acta Psychol (Amst)     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  91-100     Citation Subset:  IM    
Affiliation:
Motor Control and Biomechanics Lab, Department of Kinesiology, Arizona State University, Tempe, AZ 85287-0404, USA.
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation
Adult
Biomechanics*
Female
Humans
Male
Motor Skills
Orientation*
Pattern Recognition, Visual*
Psychomotor Performance*
Psychophysics
Reaction Time
Size Perception*
Grant Support
ID/Acronym/Agency:
NS 43502/NS/NINDS NIH HHS; R01 NS043502-04/NS/NINDS NIH HHS
Comments/Corrections

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


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