Change search
ReferencesLink to record
Permanent link

Direct link
Evidence for the involvement of the posterior parietal cortex in coordination of fingertip forces for grasp stability in manipulation
Karolinska Institutet.
Karolinska Institutet.
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Physiology.
Karolinska Institutet.
2003 (English)In: Journal of Neurophysiology, ISSN 0022-3077, E-ISSN 1522-1598, Vol. 90, no 5, 2978-2986 p.Article in journal (Refereed) Published
Abstract [en]

Grasp stability during object manipulation is achieved by the grip forces applied normal to the grasped surfaces increasing and decreasing in phase with increases and decreases of destabilizing load forces applied tangential to the grasped surfaces. This force coordination requires that the CNS anticipates the grip forces that match the requirements imposed by the self-generated load forces. Here, we use functional MRI (fMRI) to study neural correlates of the grip-load force coordination in a grip-load force task in which six healthy humans attempted to lift an immovable test object held between the tips of the right index finger and thumb. The recorded brain activity was compared with the brain activity obtained in two control tasks in which the same pair of digits generated forces with similar time courses and magnitudes; i.e., a grip force task where the subjects only pinched the object and did not apply load forces, and a load force task, in which the subjects applied vertical forces to the object without generating grip forces. Thus neither the load force task nor the grip force task involved coordinated grip-load forces, but together they involved the same grip force and load force output. We found that the grip-load force task was specifically associated with activation of a section of the right intraparietal cortex, which is the first evidence for involvement of the posterior parietal cortex in the sensorimotor control of coordinated grip and load forces in manipulation. We suggest that this area might represents a node in the network of cortical and subcortical regions that implement anticipatory control of fingertip forces for grasp stability.

Place, publisher, year, edition, pages
American Physiological Society , 2003. Vol. 90, no 5, 2978-2986 p.
National Category
Physiology Neurology
URN: urn:nbn:se:umu:diva-82518DOI: 10.1152/jn.00958.2002ISI: 000186547600016PubMedID: 14615423OAI: diva2:661789
Available from: 2013-11-05 Created: 2013-11-05 Last updated: 2014-04-23Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Johansson, Roland S
By organisation
In the same journal
Journal of Neurophysiology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 23 hits
ReferencesLink to record
Permanent link

Direct link