Linked Life Data

17503025

Source:http://linkedlifedata.com/resource/pubmed/id/17503025

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2007-8-27
pubmed:abstractText
To successfully lift an object, a person's fingers must be moved to locations where forces can be applied that are sufficient for maintaining contact and that allow for easy object manipulation. Obtaining such finger positions becomes more difficult when there is perceptual uncertainty about the location of the hand and object. However, knowledge about the amount of uncertainty could be incorporated into grasp plans to mitigate its effect. For example, during peripheral viewing the fingers could open wider to avoid colliding with or missing the object. The goal of this study is to determine the degree to which people incorporate their understanding of visual uncertainty when making a precision grasp. To investigate, subjects reached to a spatially fixed object whose retinal location was varied by fixating points 0-80 degrees to the left of the object. This manipulation controlled the visual uncertainty of the hand and target without affecting the kinematic demands of the task. We found that people systematically changed their grasping behavior as a function of the amount of visual uncertainty in the task. Specifically, subjects' maximum grip aperture increased linearly with target eccentricity. Moreover, the effect of visual uncertainty on finger trajectories could be captured by a single dimension of change along an axis. Together, these findings suggest that the sensorimotor system estimates visual uncertainty and behaviorally adjusts for it during grasping movements.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0014-4819
pubmed:author
pubmed:issnType
Print
pubmed:volume
182
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
47-57
pubmed:dateRevised
2009-11-11
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Effects of visual uncertainty on grasping movements.
pubmed:affiliation
Department of Psychology, University of Minnesota, Minneapolis, MN, USA. schl0360@umn.edu
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural